FAQ about Power Bank

1.Maintenance of Power Bank

First of all, you should use the power bank frequently. Every once in a while, charge the power bank to complete a full charge and discharge, preferably once a month. The first time you use it, you can charge your devices directly because the power bank has been charged to about 50% of electricity. In daily use of power bank, please avoid full releasing.


 Secondly, if the power bank is not used for a long time, it is better to live storage with 50% charge state storage. Full power storage will reduce the lifetime; without storage, the battery will discharge excessively and bring bad to power bank.


Moreover, pay attention to suitable environment for storage. Ambient temperature should be relatively stable, at room temperature as much as possible. Avoid high temperature, keep away from heat, not stored in a cryogenic environment. Avoid contact with metal materials, preventing from unnecessary short-circuiting. Storage environment should be ventilated and dry, less humidity.


Finally, minimize the mechanical vibration of power bank and avoid collision, trampling, hammering or piercing built-in battery case with a sharp object because these actions may cause degradation of performance or even accidents. More importantly, do not disassemble the power bank by yourself.


2.Structure of Power Bank

Power bank is composed of three parts, batteries section, circuit portion (boosting system and charging management system) and the housing part (ABS / PC material or a metal shell).



3.What is the difference between lithium batteries and polymer batteries? Which one is more stable?

Polymer batteries are also lithium-ion batteries. Lithium-ion core is pided into two core steel lithium-ion batteries and polymer batteries, positive and negative materials of both are the same, difference lies in electrolyte materials: liquid lithium-ion batteries electrolyte is a liquid, a polymer electrolyte batteries colloidal. Both have their own characteristics: liquid lithium-ion batteries discharge power greater and they have steel shell; polymer batteries are shape-variable, the shell is a soft plastic film. Some VCOM power banks use 18650 (mainstream notebook batteries nowadays), liquid lithium-ion battery, which consists of steel wrapped shell with VCOM self-designed PCB security protection board, and it can effectively prevent over-current, anti-over voltage, short-circuit proof. Some VCOM models use polymer batteries, beautiful &safe, reliable quality, easy to use.



4. How to calculate the VCOM power bank charging times for your device? 

Charging times=Power Bank capacity *Output conversion rate (0.9) * device battery charging efficiency (0.8) / device battery capacity.


5.How to know about the power bank conversion rate?

Conversion rate = (actual discharge capacity * average discharge voltage) / (actual capacity of batteries * batteries voltage), the conversion rate of high-quality mobile power bank should be more than 80%.



6. Why VCOM power bank cannot charge to some inpidual

Samsung, Nokia cell phone?

There are the below three reasons:

1). Different charging modes. The charging modes of some old Samsung and Nokia models are different from mainstream standards, it should be loaded Samsung connector to achieve compatibility. 

2). There is protection function of some Nokia models. In order to be charged successfully, they must use the original data Cables.

3). Some Nokia models battery have current protection design. If the current over 0.5 A, the battery will automatically shut down the input.



7. Can VCOM mobile power bank recharge computers, cameras?


Mobile power bank are mainly developed for phone, tablet as backup power, the output are 5.0V. 


The input voltage of notebook is 11.1V-19V, and digital cameras and SLR camera is 6.8V-9V, both are higher than the power bank input voltage, therefore cannot be recharged. If can be charged for some digital camera which input voltage are 5.0V, but need to consider the compatibility of data cables.

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