Original design intention

This charger is specially designed for 21700 batteries. There are two options to choose from. Each battery is charged independently and is not affected by other batteries. Any battery can be taken out directly when it is fully charged without affecting the charging of other batteries.
The charging power of each battery is 5W, 4 batteries are filled with 20W, and 8 batteries are filled with 40W.

A USB data cable is standard, and any USB socket on the circuit board can charge all batteries. What needs attention is the power of the charger. The general mobile phone charger is 5V 2A. If the battery is fully charged, it will cause insufficient power and slow charging.

If you want each battery to reach the maximum power charge, it is recommended to choose a 5V switching power supply to supply power.

Each section has a separate indicator light, full of green lights, convenient and intuitive.

4S

Voltage: 5V

Power: 20W

Size: 10*10.3*3.5CM

Weight: 140g

Battery type: 21700

8S

Voltage: 5V

Power: 20-40W

Size: 19.7*10.3*3.5CM

Weight: 270g

Battery type: 21700