BMS Balancer 4S 20A - 14.4 V Li-Ion 18650 cell charger with protection

Li-ion 18650 BMS 4S charger - 14.8V

Professional charger and protection (BMS) module for Li-Ion 18650 batteries. The circuit supports up to 4 cells or 4S packs with voltage from 14.4 V to 16.8 V, providing comprehensive protection for each cell in the 3.6 V - 4.2 V range.

Key technical specifications

• Supported 4S batteries: Li-Ion, LiCoO2, LiMn2O4, Li (NiCoMn) O2, Li-Po
• Supply voltage: 14.4 - 16.8 V
• Cell overcharge protection: 4.2 - 4.3 V
• Cell over-discharge protection: 2.3 - 2.6 V
• Full charge voltage: 16.8 V
• Nominal Li-Ion voltage: 14.8 V
• Nominal Li-Po voltage: 14.4 V
• Maximum operating current: 10 A
• Current protection: 20 A
• Short-circuit detection time: 250 µs
• Control circuit current draw: 6 µA
• On-resistance: 45 mΩ
• Module dimensions: 36 x 36 x 4 mm

Example applications

• Rebuilding and refurbishing batteries for power tools (e.g. 14.4V 20A drills)
• Building custom power packs for portable devices
• Emergency power systems and energy storage
• Powering audio equipment and LED lighting
• Electronics projects requiring a reliable 14.8 V power source

Benefits

• Comprehensive pack protection against overcharge and deep discharge
• High current protection at 20 A ensuring circuit safety
• Lightning-fast short-circuit response of just 250 µs
• Compact dimensions (36 x 36 x 4 mm) for easy mounting in tight enclosures
• Negligible control circuit current draw (6 µA), preventing discharge of an unused pack

Important operating information

When using the charger, only use cells with identical voltage, capacity, and internal resistance specifications. Do not mix new and used cells in one pack to ensure proper operation and system safety.