ITEM NAME:3.7V 3A 18650 Polymer Li-ion Lithium Battery Charger BMS Protection Board Description: Overcharge detection voltage: 4.25 Â ± 0.05V Overcharge release voltage: 4.23 Â ± 0.05V Overdischarge detection voltage: 2.54 Â ± 0.1V Overcurrent detection current: 5A Size: Approx. 3.5x0.4x0.2cm / 1.38x0.16x0.08inch Specification: Over-charge protection, over-discharge protection, short circuit protection, over-current protection. Wiring instructions: B+: Connect the battery positive. B-: connected to the battery anode. P+: is the battery output input positive P-: Negative input for battery output Continuous operating current: 3A Current limiting protection: 5A Package Includes: 1 Piece of BMS Charger Protection Board for Pack of 3 18650 Li-ion.B+: Connect the battery positive. B-: connected to the battery anode. P+: is the battery output input positive. P-: Negative input for battery output. Size: Approx. Current limiting protection: 5A.