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Lithium Battery Protection Board BMS 3S-5S 12V 3.7V 100A LMO / LiPo / LiFePO4
Lithium Battery Protection Board BMS 3S-5S 12V 3.7V 100A LMO / LiPo / LiFePO4
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Lithium Battery Protection Board BMS — 3S–5S, 100A, LiPo / LMO / LiFePO4, 12V
A Battery Management System (BMS) protection board for 3S to 5S lithium battery packs (LiPo, LMO, and LiFePO4 cell chemistry), rated at 100A continuous discharge current. The BMS provides essential protection functions including overcharge protection, over-discharge protection, overcurrent protection, short circuit protection, and cell balancing to ensure safe and reliable operation of lithium battery packs in e-bikes, power tools, energy storage systems, and DIY battery projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Cell Configuration | 3S / 4S / 5S (as selected) |
| Compatible Chemistry | LiPo (3.7V nominal), LMO, LiFePO4 (3.2V nominal) |
| Nominal Voltage (3S LiPo) | 11.1V (12V nominal) |
| Continuous Discharge Current | 100A |
| Peak Discharge Current | 200A (brief) |
| Overcharge Protection | 4.25V per cell (LiPo) / 3.65V per cell (LiFePO4) |
| Over-Discharge Protection | 2.5V per cell (LiPo) / 2.0V per cell (LiFePO4) |
| Short Circuit Protection | Yes (automatic recovery) |
| Cell Balancing | Passive balancing (during charging) |
| Operating Temperature | −40°C to +60°C |
| Certification | CE, RoHS |
Cell Configuration Reference
| Config | LiPo Voltage | LiFePO4 Voltage | Application |
|---|---|---|---|
| 3S | 11.1V (12.6V full) | 9.6V (10.95V full) | 12V e-bike, power tool, UPS |
| 4S | 14.8V (16.8V full) | 12.8V (14.6V full) | 14.8V power tool, RC vehicle |
| 5S | 18.5V (21V full) | 16V (18.25V full) | High-voltage power tool, e-scooter |
Typical Applications
- E-Bike Battery: 3S–5S 100A BMS for DIY e-bike lithium battery pack assembly and protection
- Power Tool Battery: BMS for DIY power tool battery pack replacement and upgrade using 18650 or LiFePO4 cells
- Energy Storage: BMS for DIY home energy storage system using LiFePO4 cells for solar power storage
- RC Vehicle: High-current BMS for RC car, RC boat, and RC aircraft LiPo battery pack protection
- UPS Battery: BMS for DIY UPS lithium battery pack replacing lead-acid batteries
FAQ
Q: Can I use this BMS for both charging and discharging?
A: Yes. This BMS supports both charge and discharge through the same B+ and B− terminals (common port BMS). Connect the charger and load to the same output terminals.
Q: Does this BMS support active balancing?
A: No. This BMS uses passive balancing (dissipates excess energy as heat in the highest-charged cell during charging). For large battery packs requiring fast balancing, use an active balancer in addition to this BMS.
Package Contents
- 1 × Lithium battery BMS protection board (cell configuration as selected)
