This is 1S 18650 Li-ion Lithium Battery BMS Charger Protection Board for 3.7V Battery.

Protections:

1. Short circuit protection
2. Overcharge protection
3. Over-discharge protection
4. Over-current protection

Pins description:

P-: negative of input or output power
P+: positive of input or output power
B-: negative of the battery
B+: positive of the battery

Features : 

1. High accuracy voltage detection circuit;
2. Using high voltage device charging terminal;
3. The built-in three-stage overcurrent detection circuit (overcurrent 1, overcurrent 2, load short circuit);
4. The battery charge and discharge can control the MOS transistor;

Package Includes :

1 x 1S 18650 Li-ion Lithium Battery BMS Charger Protection Board for 3.7V Battery