BMS Module: 3S 12V 25A 18650 Li-ion Charger with Battery Pack Protection

High-Performance 3S 12V 25A BMS Module

The 3S - 12V - 25A BMS 18650 LI-ION charger is a high-performance battery pack management device designed with safety and durability in mind. The module features a supply voltage of 12.6V and a maximum continuous current of 25A, with the ability to handle a peak current of up to 40A. With a very low quiescent current of 30 µA and an internal resistance of 100 mΩ, it is a highly energy-efficient solution. The module can operate for up to 30,000 hours, delivering reliable performance. Its compact dimensions of 56 x 45 x 1.2 mm facilitate integration into various designs.

Key Technical Features

• Supply voltage: 12.6 V
• Maximum operating current: 25 A
• Maximum transient current: 40 A
• Quiescent current: 30 μA
• Internal resistance: 100 mOhm
• Estimated operating life: up to 30,000 hours
• Physical dimensions: 56 x 45 x 1.2 mm

Integrated protections

• Cell deep-discharge protection
• Battery pack overcharge protection
• Overcurrent protection
• Short-circuit protection

Benefits

• High safety—comprehensive protection for cells and connected devices thanks to built-in safeguards.
• Energy efficiency—minimal standby current consumption (only 30 μA) extends battery life.
• Long service life—reliable operation estimated at up to 30,000 hours.
• Compact size—the slim profile (1.2 mm) allows for easy installation in tight enclosures.
• High current capacity—support for inrush currents up to 40 A enables the powering of demanding loads.

Example Applications

• Building custom power packs from 18650 cells.
• Reconditioning and repairing batteries in 12V power tools.
• Creating portable power sources for electronic projects.
• Li-ion-based emergency power systems and energy storage solutions.
• Energy management in model-making and robotics.

Operating Recommendations

When using the BMS module, it is essential to use cells with identical parameters: voltage, capacity, and internal resistance. Mixing new and used cells is prohibited to prevent damage to the battery pack and ensure proper balancing.