How to buy a power bank

Firstly, Battery. (Soft pack lithium batteries and 18650 )

Soft pack lithium batteries. Also known as a polymer cell. It is a paste-like battery that can be manufacture in a variety of shapes. The appearance of soft package on the market is more beautiful and rich in personality. Safety factor is higher, but go up the probability of bag, combustion is a bit bigger relatively.

18650.liquid lithium battery, 18 and 65 refers to the size of the cell, 0 refers to its cylindrical shape. Large capacity, up to 3000mAh but may explode, low safety factor. If the protective outer packing plate is attached, the probability of explosion will be greatly reduced.

Secondly, Protection plate.

The guard plate is design to automatically adjust when the power supply is overcharging or discharging. The charging function is automatically turne off after the battery is fully charged. The guard also improves the conversion rate and reduces the impact of resistance on charging.

Third, appearance.

I believe that the appearance is one of the primary factors when many friends buy mobile power supply. A stylish look can add a lot of fun. The higher the capacity in the same volume. The compact shape can highlight the portability of mobile power supply increase practicality.

Fourth, electrical parameters.

Charging voltage and current: charging voltage generally requires 5V. Universal mobile phone adapter. The theory of charging current is that the bigger the better, the faster the charge. Pay attention to fever

Cell capacity: general cell capacity is proportional to the volume. The larger the volume, the larger the capacity. Try to choose products with large capacity under the same volume.

Output voltage, output current: the output voltage must require 5V. The discharging current theory is also to be the larger the better, the faster the charge. Be aware of heat issues and characteristics of digital products.