12 Best Power bank in India 2020: Reviews & Buyers Guide
Planning to buy best power bank online ? Please read Buyers Guide and top selling “best power bank in india” list shared by our industry experts.
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Best Power Bank in India Buying Guide
No matter what is the worth or the quality of our smartphones, without charged batteries, they are of no use.
Thankfully, we have power banks to charge our smartphones on the go, but choosing the correct power bank for your phone is no less a task. We present to you some quick tips that would help you choose one.
Thins to Consider while purchasing the best power bank in India
Match the charge capacities:
One of the most important points to consider when buying or selecting a power bank is the capacity required. Think about what needs to be charged because a tablet takes more than a smartphone and so forth. Also some smartphones take more charge than others. To find out take a look at your smartphone specification. The battery capacity will be given under the battery area.
The charge is measured in mAh. This means milliamp hours. So a thousand mAh battery would supply 1000 mA, i.e. 1 A for one hour. Older phones probably had capacities of under 1000 mAh, but modern ones can be up to 3000 mAh. For example an iPhoneX has a battery capacity of 2716 mAh, etc.
To provide a complete charge the power bank capacity must be slightly more than that of the device to be charged – it is always best to have a bit extra to make sure the device gets a full charge.
It is worth noting that the batteries in tablets have much larger batteries, so you’ll need a much bigger power bank if you are to charge a tablet.
mAh (milliamp hours)
Arguably, the most important characteristic of a power bank is it’s charging capacity. This is measured in mAh (milliamp hours) and it reflects its electrical storage ability. In this sense, mAh is used to describe the total amount of energy a battery can store during a certain time. The higher the mAh, the more energy a power bank can store, and the more times it can recharge your device.
Some of the most common power banks range anywhere from 5000 mAh to 20000 mAh. But as technology improves, power banks will be able to pack more and more energy, going toward 50000 mAh and beyond.
For example, a 5000 mAh power bank can recharge a smartphone with a 2000 mAh battery less than two times. Due to energy losses and battery efficiency, it’s impossible for a power bank to work at 100% output. So the actual capacity of a 5000 mAh is around 3200 – 3400 mAh, close to two-thirds of its advertised capacity. Read more here on the subject of rated vs real battery capacity.
Wh represents the amount of power that a portable charger can supply before needing a recharge, and it is another unit to express the capacity of power banks.
However, cell phones and other portable devices are rated in mAh. Thus, it important to know how to calculate the Wh of your power bank, which is the result of multiplying the nominal output voltage (3.7 V) by the current dissipated by hour (mAh). For example, the capacity in Wh of a 5000 mAh power bank is 3.7 V * 5000 mAh = 18.5 Wh.
A common misconception is to think that the voltage of a power bank is 5 V due to the fact that cellphones charge at this rate, when in fact, lithium.ion batteries have been designed to operate at 3.7 V.
Power bank output charge current (Charging Speed):
When buying a power bank it’s also important to think about the rate at which it can deliver charge. This affects the charge time.
You can gain an idea of what is needed from the chargers that are provided with the device. Many small USB devices only expect a charge current of about half an amp, phones may take about an amp, and tablets around 2.5 amps.
If anything has a fast charge capability then it will take more current, possibly 3 amps. With more devices having this capability it is worth taking note.
Normally the power banks will say what current they can deliver. The lower the maximum current it can provide, the longer it will take to charge the device. Some larger power banks have multiple outputs and each output will be specified and often written on the power bank. However be aware that if a device has multiple outputs then it may not be able to deliver the maximum current to all the outputs at the same time.
So if you want to get fast charge times, then buy a power bank with a high output current. If the phone or device cannot take the maximum current, don’t worry, it will only take what it can handle.
Although most of the power banks look very similar, they can vary a lot in terms of what’s inside them in terms of charging technology. This is why we cover the most important aspects for each model we review on our site:
Also known as fast charging, it is a technology that allows high levels of current flow over USB for filling the battery capacity faster, and subsequently reducing charging time.
The voltage and the current are boosted from typical USB rates (5V/0.5A) to produce values up to 100 W of power. Basically, during the initial charging phase, which is known as the constant current phase, a high current is pumped before the battery reaches its peak voltage. This is why fast charging is more efficient when the battery is below 50% of its total capacity. However, the charge controller regulates how much current and voltage a battery can take, and thus, prevent damages.
Many standards in the market offer a faster charging rate. Some of the most common ones are the Qualcomm Quick Charge, and the USB Power Delivery (USB PD), which is the official standard in any device with a USB port. Typical rates are:
- Ø 5V/ 01 – 3 A
- Ø 9V/ 1.67 – 3A (+ 27W laptops and other power devices)
- Ø 15V/ 1.8 – 3A (+ 27W laptops and other power devices)
- Ø 20V/ 2.25 – 3A (+ 27W laptops and other power devices)
However, different manufacturers use the USB-PD standard differently, such as Apple, which supplies 14.5 V and a current of 2 A for a maximum power of 29W, and it’s able to charge iPhone from 0% to 50% in 30 minutes.
This technology allows a power bank to charge another device while it is being charged itself. It works under the principle of prioritization, which in essence takes the power being drawn from an outlet and redirects it to the device connected to the power bank.
Passthrough charging provides USB- C ports that can be perfectly used with a wide array of the latest smartphones, as well as other high power devices. This can be a very useful feature for maintaining your power bank capacity full at all times, but unfortunately, not all power bank models come with it due to safety concerns.
Some models support wireless charging, which allows phones to get charged by simply being placed on top of the power, eliminating the need of using cables. In order for this to work, however, the smartphone should also support wireless charging.
Wireless charging works by transferring energy through electromagnetic induction. For this reason, a wireless charger uses a copper coil to create an electromagnetic field, which is received by the coil in the smartphone or device. In turn, the receiving coil transforms it into electrical energy to charge the battery.
The Wireless Power Consortium’s Qi standard has been adopted for all the major smartphones and gadgets, including the last version of iPhones, such as the iPhone 8 and the iPhone X. However, one drawback of using wireless charging is that it might take longer to fully charge the battery of your device as it cannot supply as much current as wired connections.
Some power banks come with photovoltaic panels to charge their internal battery, thus supplying renewable energy to charge smartphones and other electronic devices. This is a very handy feature for situations, in which you need power in remote places, such as at campsites.
Some power banks can only be charged by solar power, while others can support both regular charging and solar charging simultaneously; however, it isn’t fast so it might need to be charged through a cable as well.
Another disadvantage of solar power banks is that most of them are manufactured with small capacity, which means they should be used in case of an emergency.
Number of ports:
Early power banks only had a single output port, but with people using them more and more and wanting to charge multiple devices at the same time, many of the larger power banks come with two and sometimes more ports. Just check that the output current capabilities for each port – are they enough? Also remember that if multiple devices are charged at the same time, the power bank may not give the maximum current to each port, there may be an overall maximum current output which will be shared between the outputs, slowing down the charging of the devices.
Size & weight:
Size and weight are an important consideration when buying a power bank, especially if you are going to use it when travelling. The greater the capacity of the power bank the larger and heavier it will be.
Lithium-ion vs lithium polymer :
There are two main battery technologies used with power banks: lithium-ion and lithium polymer. Although very similar in most respects there are a few minor differences. Lithium-ion is their high power density, lack of what’s called the memory effect (when batteries become harder to charge over time), and their significantly lower cost than lithium-polymer.
Lithium-polymer batteries are generally more robust and flexible, especially when it comes to the size and shape of their build and they tend to last longer. They are also lightweight, have an extremely low profile, and have a lower chance of suffering from leaking electrolyte.
Some power bank specifications will state whether they are lithium ion or lithium polymer, but not all.
Although the output on power banks is almost universally a USB Type A – the large USB connector that is used to interface with USB chargers, flash memory drives, etc, the connector used to charge the power bank is different. Typically it is a micro-USB, and occasionally a mini-USB, but some recently have incorporated a lightning connector so it can be charged by an Apple charger, with an Apple lead, reducing the number of different leads needed.
How to charge the power bank:
It is worth remembering that you will need to charge the power bank itself. The larger the capacity, the longer it will take. If you only have a 1 amp charger and the power bank has a capacity of 5000 mAh, then it will take five hours to charge – well a little longer because not all the charge that enters the power bank is converted to stored charge, there is an efficiency factor of possibly 80% or more, so it will take longer.
When buying a power bank, don’t forget the leads. Not all power banks come with leads, either for charging devices from the power bank, or for charging the power bank itself. Especially the budget power banks may not come with leads, assuming you will provide your own.
Some power banks have a light that is added to the unit. This often switches on after a press or two of the on/off button, and accordingly it can be used as a torch with a huge battery behind it. Whether you need this facility is a matter of personal choice.
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