Name of the part:
2S 10A 7.4V/8.4V Li-ion Lithium Battery Protection Board (BMS)
Previous work, similar parts:
Several Fritzing parts for similar 2S BMS modules exist and have been shared in the Fritzing forums. While the core functionality is the same, the exact board layout and dimensions may vary slightly. The provided image shows a common board design, often labeled as HX-2S-JH20 or similar.
Top view:
Datasheet:
Since this is a generic module, a single official datasheet is not available. However, technical specifications and wiring diagrams are widely available from vendors and in tutorials.
- Product Example with Specs: https://www.amazon.ca/Lithium-Charger-Charging-Battery-Protection/dp/B093LBBM9Y
- General Tutorial and Pinout Guide: https://www.cirkitdesigner.com/docs/how-to-use-2s-bms
Key Specifications:
- Model: Similar to HX-2S-JH20
- Charging Voltage: 8.4V - 9V
- Maximum Working Current: 10A
- Overcharge Voltage Range: 4.25-4.35V ± 0.05V
- Over-discharge Voltage Range: 2.5-3.0V ± 0.05V
- Protections: Overcharge, over-discharge, overcurrent, and short circuit.
Type:
Breakout board, sub assembly, plug in module (Other: Battery Management System)
Footprint:
The board has four main solder pads for connecting the batteries and the load/charger.
- B+: Connect to the battery’s positive terminal.
- B-: Connect to the battery’s negative terminal.
- BM (or MB): Connect to the middle point between the two batteries in series.
- P+: Connect to the positive terminal for charge/discharge.
- P-: Connect to the negative terminal for charge/discharge.