Product Overview: 2S Lithium Battery Protection Board (BMS/PCM)
The 2S BMS (Battery Management System) is a protective circuit designed for battery packs consisting of two 3.7V Lithium-ion or Lithium-polymer cells connected in series. It provides a nominal voltage of 7.4V and a full charge voltage of 8.4V. This module is essential for ensuring the safety and longevity of battery-powered devices like RC cars, portable speakers, and handheld electronics by monitoring voltage and current levels in real-time.
Technical Specifications
| Feature | Specification |
| Compatible Battery Type | 3.6V / 3.7V Lithium-ion (18650, 26650, Li-Po) |
| Series Configuration | 2S (Two cells in series) |
| Charging Voltage | 8.4V – 9.0V |
| Continuous Discharge Current | 3A to 10A (Model dependent—standard is 5A-8A) |
| Instantaneous Current Limit | 10A – 20A |
| Quiescent Current | < 10uA |
| Internal Resistance | < 100mΩ |
Protection Parameters
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Overcharge Detection: 4.25V ± 0.05V (per cell)
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Overcharge Release: 4.05V ± 0.05V (per cell)
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Over-discharge Detection: 2.50V ± 0.1V (per cell)
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Over-discharge Release: 3.00V ± 0.1V (per cell)
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Over-current Detection: Activated during current spikes to prevent cell venting.
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Short Circuit Protection: Self-recovery or recovery after disconnecting the load.
Connection Guide
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B+: Connect to the Positive terminal of the battery pack.
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B-: Connect to the Negative terminal of the battery pack.
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MB (or BM): Connect to the junction point between the two batteries.
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P+ / P-: Output to the load and input for the 8.4V charger.
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