How to tell if a power bank in good quality

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xtarflashlight's picture
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Location: Shenzhen
How to tell if a power bank in good quality

Today I’d like to discuss how to tell a good quality power bank.

When we buy a power bank, we mainly consider two points: capacity and safety, followed by appearance,size and price.

Capacity of power bank

The power bank has three basic elements, namely the shell, the circuit board, and the battery cell. As the core component of the power bank, the battery cell has the highest cost. For example, a regular 20000 mAh power bank requires about 8 batteries. Assuming that the cost of each battery is US$5, the cost of a single power bank here will cost US$40. If the price of a 20,000 mAh power bank is only US$20, this power bank must be of poor quality.

The battery cells of power bank are generally lithium polymer or li-ion 18650 batteries. The larger the capacity, the larger the size. If your power bank has a large capacity but in a very small size, then you need to pay attention to its quality.

In addition, you can calculate the charging times. For example, a power bank, marked as 10,000mAh, can charge your mobile phone 3-4 times, but in fact it runs out after 1-2 times (when the power bank is fully charged), this power bank is likely to have a false capacity.

Safety of power bank

Whether the power bank is safe depends largely on two aspects – the battery cell and the shell.

The quality and quantity of battery cell must meet the standard. Inferior power bank batteries are prone to short circuits after rusting, which may cause explosions. At the same time, in extreme environments such as high temperatures, inferior batteries are more likely to explode.

The shell of a good power bank should have the ability to withstand flame retardancy and gravity shock.

Flame-retardant refers to the shell can be extinguished automatically after being ignited when the power bank occurs an explosion or combustion accident, which can prevent the battery cell from spontaneous combustion and cause further harm.

Besides these aspects, what else should we pay attention to?

Edited by: xtarflashlight on 08/06/2020 - 02:41
TimMc's picture
Last seen: 19 hours 7 min ago
Joined: 06/26/2020 - 02:22
Posts: 558
Location: Melbourne, Australia

Size and weight
Smaller and lighter power banks are easier to carry around.

Lithium packs may be smaller compared to packs with 18650 cells. If you’re already carrying around a bunch of 18650 cells in your flashlights, then maybe you could chuck them in an 18650 power bank. But if you want to travel light and have a specific need for a power bank, 18650’s might be too bulky.

If the capacity is too large, it might get confiscated at an airport.

Port type and charging capability
USB-C PD and QC3 should be supported so that you can use devices that work best with those.

E.g. Input USB-C PD, Output USB-C PD QC3, USB-A QC3

People shouldn’t have to carry around a USB-A to Micro USB cable to charge their power bank.

USB-C is more popular these days.