Reliable 3S 12V 40A BMS (Battery Management System) for Li-ion / Li-poly battery packs. The system balances cell voltages and provides overcharge and over-discharge protection, thus extending battery life and ensuring safe operation.
Customization
- 12 Class V (3S) e-mobility, DIY and power projects
- LED lighting, UPS, audio, modelling, small e-devices
Main functions
- Balancing (3S): reduces cell imbalance during charging
- Protections: overload, over-discharge, short-circuit and over-current
- Continuous discharge up to 40 A – reliable for 12 V systems
Specifications
- Number of cells: 3S (3 cells in series)
- Chemistry: Li-ion / LiPo
- Nominal voltage: 11.1 V (~12.6 V when fully charged)
- Max. Continuous discharge: 40 A
- Balancing: passive (3 channels)
- Temperature protection: supported if the version includes a sensor
Installation notes
- Follow the terminal diagram: B-, B1, B2, B3(=B+), P-/P+, C-/C+ (if separated)
- Perform the first start-up without load, check cell voltages
- Use CC/CV 12.6 V charger (3S Li-ion)
- Fuse on battery line recommended; ensure ventilation
FAQ
Is it suitable for 18650 and 21700 cells?
Yes, if the pack is 3S Li-ion/LiPo and the current and cooling requirements are met.
Can I charge via the BMS?
Yes, with a 12.6 V CC/CV charger (3S).
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