Nowadays the usage of battery-powered equipment has increased tremendously.
So has the issue of fast and portable recharging of the battery.
A Powerbank has become the most convenient & Portable Source for charging.
So, Which is the best power bank for 2021?
Well, basically, the Best power bank can be decided from the factors like its compatibility, affordability & portability.
Read on. This article will help you choose the best Power Bank 2021 can offer!
Top 7 Power Bank from Mi, Ambrane, Intex with Price Comparison & Review
Mi Power Bank 3i 20000mAh
The Ultimate Source of Power
Save 32% by ordering NOW!
Triple Port Output
You can charge 3 Different Devices at a time.
Now, you can charge your mobile phones, cameras, and tablets too.
Smart Power Management
If you want to Low Power charge your phone, you just have to Double Press the Powerbank.
This feature can charge your low Power Devices (such as fitness bands, earphones) safely.
12 Layer Advanced Smart Protection
Due to the unique 12 Layer Design, your Smartphone & devices are effectively shielded against overheating while charging.
The Power banks by Mi are Profoundly moderate and light on the pocket.
Not only that, but for the Mi Power Bank, Amazon offers 25% off from the first cost.
It comes in two versions: 10,000 mAh and 20,000 mAh.
Design & Built-up Quality:
The dimensions of the power bank are 15.1 x 7.2 x 2.6 cm; 434 Grams.
The Power Bank catches eyes with stylish Metallic Blue and Sandstone Black color shades.
A plastic body with a matte finish design that gives a premium look comes with the Mi Power Bank 3i 20,000mAh model.
There is a USB Type-C port, a Micro-USB port, two USB Type-A ports, and an LED battery level indicator on the front.
With the durable 12 layers advanced protective design, your mobile devices are effectively insulated against overheating, over current and short circuits.
Increased Charging Capacity with Triple Port Output:
With the 18W fast charge help, the high capacity 20000mAh power bank allows you to simultaneously charge three devices at one go and do it much faster.
Low power mode:
The low power mode can be used to charge devices such as fitness bands and Bluetooth speakers that require low power.
The lithium polymer batteries are not only safer but also increase the charging conversion speeds and stabilize the voltage with the use of advanced resistance-capacitance sensors.
The power bank is available with Six months manufacturer’s warranty.
Inside the box:
As a part of the kit, The Power Bank, One USB Cable & One User Manual is provided.
It gives 9 layer circuit security which improves proficiency and safety
Light weight quality
Accompany low charge mode is reasonable for fitness band and Bluetooth gadgets
Excellent ABS lodging material to shield the power bank from inner damage
Vey short term Warranty
Mi 10000mAH Li-Polymer Power Bank 3i with 18W Fast Charging (Midnight Black)
Another venture by MI, The Mi power bank 3i 10000mAh is a portable Power hub with 18 watts fast-charging that ensures that your devices charge rapidly and you can always be ready to go.
Below are the specifications:
The power bank features two-way fast charging and provides 18W(maximum) fast charge support, allowing you to quickly and efficiently charge your devices and yes, the power bank itself.
Dual Charging Input:
The all-new, powerful 3i power bank supports charging via a micro-USB and also a type-c port.
To charge the power bank, you do not need to search for a specific cable anymore.
Dual USB Output:
The new, versatile design comes with two USB ports, enabling you to charge two devices at once simultaneously.
Light & Powerful Design:
The Dimensions of the Power Bank are 14.8 x 7.4 x 1.5 cm; 251 Grams.
The aesthetically pleasing power bank, which is easy to be carried, is a treat for the eyes and feels extraordinary in the hand.
The sleek design of the power bank is available in two colors: black & metallic blue.
The aluminum alloy case is powered by high structural strength and can withstand hits and accidents.
Smart Power Management
To enter a 2-hour low charging mode, simply double-press the power button to charge low-power devices such as the Band & Earphones safely.
6 months of domestic warranty is backed up with the power bank.
Inside the box:
A Power Bank, One USB Cable & One User Manual is provided in the kit.
Premium scratch less treated body
It gives 912 layers of circuit security which improves productivity and safety.
Dual input port (Micro-USB/USB-C)
Does not support dual charge technology
Ambrane 10000mAh Li-Polymer Power bank with Compact Size & Fast Charging for Smartphones, Smart Watches, Neckbands & Other Devices (Capsule 10K, Black)
This Power Bank has a 10,000 mAh polymer battery with a high conversion rate for performance and charging.
Compared to non-branded lithium-ion batteries, the battery is much more durable, reliable, and safer.
Rugged Design & Built:
The power bank’s outer body is made of strong ABS plastic material that not only provides the product with a stylish quality finish but also makes it more durable and resistant to scratches or marks.
Ergonomic Design & Easy To Carry:
The power bank dimensions are: 13.55 x 6.9 x 1.6 cm; 188.7 Grams.
This elegant capsule-looking power bank is available in three color variants: Black, Blue & White.
In order to create an aesthetic effect, the power bank is built in an interesting capsule form.
As it is easy to carry and keep when charging, the shape also enhances the device’s portability.
All-Around Safety Assurance
The power bank is fitted with best-in-class Integrated Circuits that have over 9 layers of protection against overheating, short circuit, accidents & much more.
Dual USB Output Ports:
Using dual USB ports, the Power Bank lets you charge two devices at the same time. 5V/2.4A is the maximum current output from the ports when charging two units.
LED Charging Indicator
It comes with a front-facing LED charging indicator that shows the power bank’s battery status.
Inside the box:
A Power Bank, One charging Cable & 1 User Manual are given in the box.
LED lights indicate Battery level
Short USB cable
Poor Conversion rate
Value for money
Redmi 20000mAh Li-Polymer Power Bank (Black), USB Type C and Micro USB Ports | 18W Fast Charging
Redmi is a sub-brand of Xiaomi that specializes in Android smartphones that are budget-friendly.
The Redmi brand has also recently concentrated on the introduction of smartphone accessories, with one of the first products being the Redmi power bank.
The all-new 20000mAh Redmi Power Bank is a portable power hub that comes with quick charging features. Which can be your perfect travel companion for a long journey.
Below are the specifications:
Redmi Power Bank comes with high-density batteries embedded with advanced Li-polymer that make it sturdy and also maximize the charging capacity.
Fast Charging Feature:
18W Fast Charging is available with the latest Redmi Power Bank.
It supports charging outputs of 5.1V/2.4A, 9V/ 2A MAX, and 12V/1.5A MAX to ensure your devices charge efficiently and rapidly.
With Dual USB ports, Redmi Power Bank intelligently adjusts power outputs of up to 18W to provide fast and efficient charging for each connected unit.
Dual Input ports:
Now, Charge your Powerbank quickly with a micro USB or even A USB-C port, No need to search for a special cable.
The Dimensions of the Power Bank are 15.4 x 7.4 x 2.7 cm; 447 Grams.
This power bank is made of high-quality material and comes in the classical color of black and white.
The anti-slip edge texture provides a great hand feel and avoids annoying slips and drops.
12 Layers of Protection:
Mi Power Bank has an advanced chipset security level that guarantees short-circuit, over-current, over-voltage, over-charge & discharge protection, etc.
Now with Multiple Output ports & a Massive battery, charge any device.
You can charge any device from mobile to Bluetooth speakers, earphones, headphones, and even fitness bands.
Inside the box:
A Power Bank, A flat Cable & One Instruction Manual are provided in the kit.
Programmed power on when the device is connected and off at fully charged.
Syska is India’s leading producer of electronic accessories, having its business extended to consumer durable items such as Bluetooth speakers and headphones.
Syska has gained publicity when the late Irfan Khan joined in as their brand ambassador. He was a very well promoter of Power Banks, over other products.
The Syska X110 11000 mAh Power Bank is popular in today’s well-connected generation. With its smart power management solution and accurate IC security to avoid overcharging or discharging, this device is highly efficient with a compact, and handy structure. Below are the Specifications:
A mark of the standard:
To ensure quality & trust, Syska power banks are BIS certified ensuring their accurate power and high quality.
Design and Build Quality:
This Power Bank is made of high-quality plastic ABS that feels tough and sturdy when holding the unit in your hand.
The Dimensions of the power bank are 13.8 x 6.2 x 2.2 cm; 272 Grams.
This item is available in double color combinations such as White-grey, White-blue & Black-grey.
On the surface, the power button is embossed on the chassis and is slightly elevated for easy access.
For easy accessibility, the micro USB charging port and the output ports are located on the sides.
On the front, there is an LED status indicator set up that highlights the battery percentage.
Within, the Syska Power Bank has an 11,000 mAh Li-Po battery pack.
To guarantee the security of the consumer, this battery pack has been rigorously tested under safety standards given by government agencies for assuring safety.
Once Discharged, It takes 9 hours for the battery to fully recharge.
This power bank comes with accurate IC security that decreases the risk of overcharging and short circuits resulting in battery failure.
On the power Bank three output ports present, two of which are rated at 10W and one at 5W, make it easier to charge from either of these ports.
Compatible with a Wide Range of Devices:
This sturdy, standard quality power bank is compatible with not only a wide range of smartphones, but also tablets, and other devices.
Syska Provides Six months warranty from the date of purchase on this Power Bank.
Inside the box:
One Micro USB Cable, One Insutuctioin guide, & Warranty Card, Charger is not included in the kit.
Safety feature like over discharging and over charging
High quality ABS housing material to protect Power Bank from inner damage
Takes lot of time to charge
User can get only 7,800mAh out of 11,000mAh capacity
When it comes to having an emergency back up power for your smart devices, it is the perfect partner.
Your digital camera, media player, cell phone, and tablet can be charged. In addition, it supports output ports, so you can charge more than one unit at the same time conveniently.
Below are the Specifications:
Sleek & Simple Design
The sleek body makes the Ambrane 10000 mAh power bank look classy along with the black, gold & white color combination.
For optimal grip, it has a balanced body. The compact design allows the charger to be held in your pocket or handbag.
The dimensions of the items are:14.2 x 2.3 x 6.2 cm; 277 Grams.
It is available with torchlight & four indicative LED Lights.
This portable charger by Ambrane comes with a power of 10000 mAh.
Therefore, if you use a smartphone with a 2500mAh battery, you will be able to completely charge it approximately 5 times a day.
The Ambrane 10000 mAh power bank, powered by a lithium-ion battery, uses advanced chipsets that make the power bank extremely safe to use.
Protection against hazards:
It comes with multiple protection layers such as overcharge protection, protection against short circuits, protection over-current, and protection against overload.
The power bank supports different output ports so that you can simultaneously charge more than one device conveniently.
So, while on a journey, Your digital camera, media player, cell phone, and tablet can be easily charged.
Easy to use ergonomics:
For easy and fast use, the buttons and connection ports are precisely aligned on the periphery of the power bank.
The power bank is backed up with a one-year domestic warranty.
Inside the box:
In the box, you will find a Warranty Card, User Guide, One Charging Cable & Power Bank.
Assured safety like temperature resistance, over charging and over discharging
Input, output over voltage protection
Output is only 7,500mAh while capacity of 10000mAh
The IT-PB12.5K has an alluring look with a ground-breaking LED on top for searching things, reading/writing in obscurity, or working in low light.
Design & Built:
The sleek-looking Intex Power Bank is available in black & red shade.
The Product dimension are 14 x 6.4 x 2.3 cm;290gms
The exterior of the power bank is an eye-catcher.
Three USB ports are mounted on the side & One bright Torch with a micro USB port is mounted on the top.
The 12500 mAh Lithium-ion battery can charge up to 3 devices at a single with 3 USB ports.
The Life cycle of the battery is greater than 500 times.
This Power Bank is compatible with smartphones of all brands.
1-year warranty by Intex is covered for this Power Bank.
Inside the box:
Power Bank, 1 Micro USB Cable, User Manual, & Warranty card are provided in the kit.
Three ports, One Torch
Good power backup that does not get drained in idle time
How does a Power Bank work?
Tip: Keep humidity-free premises While using Power Banks.
Keep your metals away, as the immense charge is held inside the mobile Power Bank.
For smaller requirements, You can opt for smaller devices aka mini Power Bank!
Portable Power Banks consist of a particular battery in a case with a specific circuitry to control the power flow.
The Power Bank then acts as a portable mobile charger and allows the energy to be transferred from the power bank battery to a device, i.e. smartphone/laptop.
This Power Bank or commonly called a portable charger functions for any USB-charged device.
So, apart from your phone, What types of devices can be charged via a Power Bank?
Not only the smartphones but You can also charge your Cameras, GoPros, Portable Bluetooth Speaker, GPS systems & MP3 players!
Virtually, anything that charges from USB at home can be charged from a Power Bank. Yeah but don’t forget to charge your Power Bank too.
Moving to the technical aspect of the Power Bank charger, let’s have a look at the Power Bank circuit diagram shown below.
Compact Power Banks comprise a specific battery for a situation with particular hardware to control the power stream.
The Power Bank circuit comprises of the USB-IN, for example, the USB lithium-particle charger module, 3.7V/2600mAh lithium-particle battery (BATT.1), an on/off switch (S1), and a USB-OUT, for example, the DC-DC help converter Power Bank module.
Lithium-ion: Lithium-ion: Quite modest, this one offers a powerful thickness and doesn’t lose charge over the long run.
Lithium-polymer: Lithium-polymer: The lightweight, generally spillage evidence lithium polymer batteries are very adaptable fit as a fiddle and size and keep an eye on last more than its counterpart.
Types of Power bank
Before opting for the best Power Bank, Let’s Go through the Types of Power Banks available across the market.
Along with size, consider the features like capacity, charge level, etc.
Here are the available types of Power Banks:
(A) Based on the Power Source:
Universal or Standard Power Bank:
These are the standard portable power banks that are available in stores and online.They are charged like USB chargers from regular USB sources.These power banks are typically charged from a regular USB adapter and have some series of small LED lamps or a simple alphanumeric indicator showing the level of the charge as a percentage of the overall charge.
A micro USB connector is usually used as the connecting element. The power bank can be used for charging other devices until fully charged.
There may be one or multiple USB sockets that can charge the devices that need charging.
Solar Power Banks:
These solar power banks can use sunlight to charge up, as the name implies.They have photovoltaic panels to do this.As solar charging is slow, it is also possible to charge them from a USB charger.
Solar charging is a helpful backup, particularly if you are moving away from the power of the mains.Some of the more advanced solar power banks have solar panels that fold out to present the Sun with a wider area, to ensure that the full amount of solar energy can be converted.
These solar-powered ones, like the traditional wired power bank, have standard Type-A USB output or output connectors and a micro USB for a USB charger input.
Wireless Power Banks:
Power banks that are themselves charged from a regular USB source can be obtained, but they can wirelessly charge phones and other wirelessly charged compatible electronic devices.These power banks use the Qi standard that nearly all electronic devices that can be wirelessly charged have adopted.
The electronic device to be changed is put on the power bank.Orientation is always necessary, so check with the directions, to switch on the wireless charging function, a button normally has to be pressed, and then everything goes on until the device is charged.
When the charging is complete, it is better to toggle the wireless charging power bank off. So that the power bank will not be unnecessarily discharged.
(B) Based on the capacity:
Low Capacity Power Banks:
You might be surprised, but these Power Banks are the most useful types of mini portable chargers on the market.Low capacity means that a limited number of batteries are used by these power banks, and most of them use a single battery most of the time.
But, they’re lightweight & quite handy.However, there are two main types of Mini Power Banks, according to the use of two main battery types.
Power Banks with batteries made of ions and those that use batteries made of polymer.They don’t have a lot of power since they are tiny in size.
As a result, they’re only intended once or twice for charging smartphones.
Most of them have a single USB port, so multiple devices can’t be charged at once.
High Capacity Power Banks:
Power banks that have a lot of power are those that have 20,000 mAh or more, and they can charge all kinds of devices to their full power many times over as a consequence of that much power.Charging a lot of devices at once is convenient because you would be able to charge a smartphone, tablet, and other USB charging devices at the same time.
These types of chargers may also provide better-charging technology for laptop charging, such as Fast Charge, Type-C, and even DC Output ports.
Although these portable chargers are useful, the drawback with them is that they are very big and heavier in weight.
They can not be carried for long periods.
Reasons for Investing in a Power Bank
Power Bank is travel friendly:
Yes, whenever or wherever you go, you can take your power bank with you.
It is actually a portable battery, after all!
The size of this device is very compact and it can also fit comfortably into your pocket.
This device’s compactness makes it a common purchase.
It is quite a handy device that will ensure that your cell phone, tablet, or laptop is backed up.
When your system runs out of battery, Power Bank can be your savior:
Running out of your battery would still put you in a sticky spot.
Imagine While you are on your way to work, you are making a presentation on your phone and your phone’s battery dies!
Yeah, all the hard work went to waste.
This is one of the prime reasons why it is kind of a must to purchase a portable charger.
There’s one more fact, it’s not always possible to find a charging point around you.
You can have a power bank with you at all times for cases like this.
Power Bank can charge almost evrything:
Okay, it goes without saying that in the personal life of an individual, a power bank does play a crucial role.
Well, let’s just say that for those who frequently work on their mobiles or tablets, a portable charger can be quite a handy product.
To make serious business deals, many company owners need their cell phones in working order at all times.
To carry on with their job, even professional photographers need their cameras fully charged.
So, in cases where your device’s battery is about to die or is dead, a power bank will still come to the rescue. Agreed?
Buying a Power Bank won’t cost a bomb to your pocket:
The idea that the best brands of power banks cost you a lot is completely fallacious.
At pocket-friendly rates, even the highest-quality energy banks are affordable.
Yeah, the same can be said if you opt for a brand that is world-class.
The prices, be they online or offline, are very reasonable.
In our seven best products list, we have also covered the best power bank below 1000!
Do you need to buy a power bank for more reasons?
Top Power Bank Brands in India
Syska was started in 1989 by the SSK group, and the SSK (Shree Sant Kipra Appliances Pvt Ltd) group has a wide range of products of high quality. Power banks, chargers & cables, wearables, wires & cables, irons, extension cords, and many more are included in a list of their products.
You can rest assured that, since they are built to run for years, this brand will give you a great purchase for the money. The battery life is extended and getting your gadgets charged can be an outstanding one-time investment. Fast charging is allowed, giving it the right to quickly and easily charge the devices when you are going to your office.
There is a multi-protection circuit design that is designed to cut off electricity flow if there is some risk of overcharging or a short circuit in the system. Therefore, while using this power bank, you are assured of complete protection.
Charge your phones on the go, as they slip comfortably into your pocket or purse with a super-compact build.
The new variety of Syska power bank also has a Type C input facility with two outputs option, whether it is your digital camera or smartphone. Whenever you are out for a ride, get your camera and phone charged simultaneously!
The latest models also feature the new shunt option to add to all the privileges, allowing the power bank to self-charge while easily charging your mobiles and tablets. Syska is one of the best power bank companies in India without any doubt.
What we liked about Syska:
• It complies with the Indian Standards Bureau, which guarantees protection.
• It has a special overcharging and discharging security feature.
• Multiple ports are given for charging more than one device at a single time.
• An advanced current shunt comes with it.
• It has extended battery life.
• The standard power banks with durable life are provided at an affordable price.
If you’re a fan of beautiful designs for a high-quality smartphone, then you might be well aware of MI.
In order to ensure that all its customers can recharge their devices anywhere and anytime, the company has extended its coverage into the power bank market.
For the past few years, MI smartphones have dominated India’s markets.
The power banks that this company produces are not an exception. This one is a perfect gadget to take to your office or even on your travel days.
Before leaving the home, you are relieved of the burden of charging all your devices as this little storehouse of power becomes the source.
What we liked about MI:
Qualcomm Quick Charge 3.0 for devices compliant with rapid charging
The anti-slip and anti-scratch features of this Mi power bank are just a couple of the many outstanding features it has.
Low power charging for devices with low power, such as fitness bands and Bluetooth headsets
Crafted with a perforated outside PC+ABS material for anti-slip and scratch-resistant properties.
The smart power output mechanism makes it compatible with different devices.
It offers 9-layer circuit security that enhances efficiency and safety.
The Power Banks are provided with a six-month guarantee.
High-capacity, 20,000mAh lithium-polymer batteries are provided in the power banks.
Intex is a famous power bank firm that manufactures quality goods.
Intex’s power banks are a culmination of style, portability, and features. Such characteristics make it one of the best on the market.
The slim dimensions and compact sizes of Intex power banks make them super easy to hold when traveling.
They are light in weight and give a tight grip, which avoids slipping from the hand when held.
Thus, with this wonderful purchase, there are lots of benefits that you will enjoy.
What we liked about Intex:
• For smaller devices like exercise bands and headsets, their power banks are available with lower power outputs.
• The power banks Support simultaneous charging of three devices using the 3 USB output ports available
• It has a lithium-ion battery with a rugged finishing that is almost cylindrical.
• The company provides a 1-year warranty.
• The power banks come with a USB cable for recharging themselves.
Philips is one of India’s most trusted brands. The power banks they create live up to their standards as well. Depending on the mAh requirement, there are different models of Philips power bank that you can choose from. Thus, from a variety of models of power banks that Philips manufactures, you have the option to choose according to the specifications.
The size of the Power Bank that this brand provides is lightweight, and the style is elegant enough to comfortably fit into your bags. They provide lightweight power banks that, for you, are a travel-friendly option. Besides, the excellent compatibility it provides can’t be ignored.
Whether it be your laptop or tablets, and with different models, the power bank is compatible with various brands.
In addition, any USB charging system such as Bluetooth equipment can be recharged anywhere and at any time using this power bank.
Instead of all the equipment you are carrying, all you need is to get the power bank charged and packaged into your luggage.
Therefore, you are all set to fly miles, without any burden for your devices to run out of fuel.
Philips’ power banks typically come with a premium matt finish in black and white colors, making it a perfectly chic and trendy accessory to move with!
What We liked about Phillips:
• The power banks are made of lithium polymers and, with optimum performance, can charge all your devices very quickly.
• They offer durable power banks with stylish & ergonomic designs.
• Compact, Long lasting & travel-friendly Power Banks.
• The power banks are compatible with even your cameras and Laptops.
• A USB interface is provided so that you can easily recharge your Power Banks.
Ambrane Pvt Ltd is an Indian electronics company with 5+ years of experience that is renowned for its quality products. They make earphones, headphones, speakers, energy banks, etc.
When we talk about performance, the product manufactured by Ambrane ensures high durability and quality.
The batteries used in this power bank are much more stable than those used for non-branded lithium.
In addition, the outside of the power banks is curated from ABS plastic, which is durable, giving the exterior surface a stylish finish.
The Ambrane power bank bodies are built to easily avoid any scratch or injury.
In order to make portability convenient, Ambrane presents the bank with an ergonomic design.
They usually come in the form of a capsule, making it easy to slip in or carry in your purse when charging the devices. For the price you pay, you also get a great aesthetic look!
The power banks are availed in various mAh capacities, and you have the freedom to choose as per your requirement.
Power banks come with a safety guarantee of 9 layers to provide the ultimate safety for use.
In addition, together with an LED display to show a charge, you get two USB ports to charge two devices simultaneously.
What we liked about Ambrane:
• They produce really lightweight units so that you can easily carry them around.
• The exterior is made of ABS plastic material that makes it very long-lasting and also provides it with a premium finish.
• The outer body of the power banks is durable and scratch-resistant, which makes them long-lasting.
Some of the finest Power Bank above 15000 mah capacity are:
• Mi 20000 mah Power Bank
• Samsung Power Bank25000 mah
• Phillips Power Bank 30000 mah
• Samsung Power Bank 30000 mah
• Sony Power Bank 32000 mah
Equipping a good battery pack with the specified requirements is very essential. Nokia was the first brand to launch wireless charging everywhere, which is a great idea and went well with the youth.
Although wireless Power Banks and chargers are available everywhere around the market, here are a few good brand names for your reference:
Navigating to wireless mobile chargers, Samsung introduced a few wireless devices: wireless Samsung Power Bank and wireless Samsung mobile charger duo pad.
Although Power Banks are devices for travellers, Power Bank in flight is a total no-no! All of this happened after Samsung phones ominously started catching fire, there came a limitation to the devices and power bank allowed in-flight and power bank Samsung offered were banned.
Yes, you can. Although retail stores may provide you with different types of Power Banks, they may not be aware or have the means to make the customer aware about different types of Power Banks, different map, which Power Bank is ideal for your phone, etc.
These vendors might give you a list of Power Banks that are the best Power Bank in India 2017. Meaning vendors may not necessarily update themselves with the changing market trends.
We suggest that you do your research online. You may buy the Power Bank offline, although you’ll miss out on a lot of discounts .
The question is very relative and depends on your device. Although choosing a Power Bank is not an easy task, here’s some help
•Be informed about your battery and the mobile charger circuit.
•The size is a feature that needs attention. The size of the Power Bank should be equal or greater than the size of your smartphone battery
•Make sure the output voltage is equal or higher than that of your mobile battery charger.
•If you need to charge more than one device at a point in time, make sure you check if the battery bank has more than one output ports.
•Buy devices that are short circuit proof
•Always trust brands. A lot of them offer good quality and higher capacity devices such as: Samsung Power Bank 20000mah, Syska Power Bank20000mah, Sony Power Bank 20000mah, 20000mah mi Power Bank 2i, Reconnect Power Bank, etc.
Every year has a new list of the top 10 Power Banks. Some of the finest Power Banks brands as claimed by top technical magazine, Digit are:
There are two main forms of lifetime that are associated with Power Banks.
•Charge discharge cycles: Any rechargeable battery will gradually wear out. Normally the lifetime of a battery is quoted in terms of the number of charge discharge cycles it can undergo before its performance falls by a given degree. Some cheaper Power Banks may only have a life of 500 or so charge discharge cycles, but better ones will have lifetimes of many more charge discharge cycles.
•Self-discharge time: All battery cells, whether rechargeable or primary have a certain level of self-discharge. For rechargeable batteries these days with their own control circuitry, a small amount of power is required to keep these circuits alive. As a result, there is only a finite time that a battery will remain charged.
A good Power Bank can hold a charge for up to 6 months with only a small loss of charge, but lower quality ones may only retain a useful charge for about a month. These figures are for room temperature, but storing them outside these temperatures considerably reduces their performance.
While some tablets can accept lower input (1A or 1.5A), the charging is slower and sometimes can only be charged when the tablet is in sleep mode. So, before you throw a fit, here are some things you might want to consider:
o It might be about the cable and not the charger. Get the cable changed and try again.
o Make sure the battery provides 2 amp and above. A 3 amp mobile charger ideally does the trick.
o There might be a compatibility issue: For e.g.: Samsung Tab might need you to use the designated cable and connector.
Various shapes and sizes and sizes are available in Power Banks.
Some are useful as a car mobile charger, some as bike mobile charger.
Follow the instructions at your own risk. The guidelines have been taken from instructibles.com. The same device will not work for iPhone.