4S 20A BMS Protection Board HX-4S-A20 Rev 1.1 for 14.8V 16.8V 18650 Li-ion Battery Packs

This is a 20A protection board designed to manage and protect a 4-cell series lithium-ion battery pack (4S configuration). It ensures safe charging, discharging, and battery balancing (in some versions), making it ideal for medium-power DIY projects.

Specifications

• Model: HX-4S-A20 Rev 1.1
• Battery Type: 4S Lithium-ion (18650/21700/Li-ion cells)
• Nominal Voltage: 14.8 V
• Full Charge Voltage: 16.8 V
• Continuous Current: Up to 20 A
• Cell Connections: B-, B1, B2, B3, B+
• Output/Charging Terminals: P+, P-