5V 2.1A Power Bank Charger Module Charging Circuit Board Step Up Boost Power Module for Xiaomi Mobile Power Bank DIY

Description:

- Output: DC 5V/2.1A max

- Power Supply: 3.7-4.2V

- Can be used for 4-8 series XiaoMi Power Bank Battery

- B-: Negative

- B+: Positive

Feature:

- The battery must be in parallel rather than in series.

- Test voltage before installation.

- One bad battery will affect the whole group battery.

- Recognize the positive and negative. If you put them in the wrong position, mainboard IC will definitely be destroyed.

- To avoid damaging the motherboard, exposed part of the wiring must be wraped well.