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Part Number: HX-2S-JH20, ensures correct fit and reliable compatibility. Direct Fit: Compatible with 2S 7.4V (2x 3.7V) Li-ion Lithium batteries, for overcharge protection, over-discharge protection, short circuit protection, and overcurrent protection. Charge Controller: 10A BMS module protects batteries during charging. B+ connects to the positive terminal of the battery; B- Connect to the negative terminal of the battery; MB connects to the junction between battery 1 and battery 2. P+ is connected to the positive terminal of the charge/discharge terminal (charge/discharge terminals are shared); P- Connect to the negative terminal of the charge/discharge terminal (common to both charge and discharge terminals).