3S 25A BMS 12V Li-ion Battery Protection Board

Protect your 3-cell lithium-ion battery pack with the 3S 25A BMS (Battery Management System). This robust protection board safeguards against overcharge, over-discharge, overcurrent, and short circuits — essential for DIY power banks, e-bikes, solar storage, and UPS systems.

• Cell Configuration: 3S (3 cells in series)
• Nominal Voltage: 12.6V (fully charged)
• Continuous Discharge Current: 25A
• Overcharge Protection: ~4.25V per cell
• Over-discharge Protection: ~2.5V per cell
• Short Circuit Protection: Yes
• Balance Function: Yes (passive balancing)
• Compatible Battery: 18650 / Li-ion / Li-Po
• PCB Size: approx. 70mm x 50mm
• Mounting holes for easy installation