BMS 3S (12.6V -20A ) Lithium Battery Protection Module

From the shop's description

BMS 3S (12.6V -20A ) Lithium Battery Protection Module is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. Features: Module name: 3S 12.6V Li-ion Lithium Battery 18650 Charger Protection PCB Board Suitable range: For nominal voltage 3.6V 3.7V lithium battery(Including 18650,26650, lithium polymer batteries) Product Size: 64mmx20mmx3.4mm Material:Metal Charging voltage: 12.6V Maximum output current: 20A Maximum output power / charging power: 252W Precautions: 1.Strictly according to the diagram wiring: 0V/4.2V/8.4V/12.6V,Otherwise it will cause damage to the chip. 2.After connection,it need to first charge activation, then will have the output. Attention: Do not mix the good battery and poor battery to use. The internal resistance of 3 battery capacity are closer will be better. It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.