Features:
Input port with micro USB female, can directly use mobile charger for input to the lithium battery, and still retain the input voltage wiring solder joints, can be very convenient.
Connect the battery to B + B -, insert mobile phone charger to the USB Female then red light is charging and green is fully charged.

Specification:
Input voltage: 5V
Maximum charging current: 1000 mA
Charge cut-off voltage: 4.2 V + / - 1%
Battery overcharge protection voltage: 2.5 V
Battery over-current protection current: 3 A
Input interface: Micro USB
Dimension: 2.6 x 1.7 cm

Package includes:
1/3/5/10/20 (optional) x Charger module board