ITEM NAME:2S 7.4V 4A 18650 Lithium Battery Protection Board Double String Protection qwe Descriptio n Description: Features: (1) Built-in high-precision voltage detection circuit; (2) The terminal connected to the charger is a high withstand voltage device; (3) Built-in three-stage overcurrent detection circuit (overcurrent 1, overcurrent 2, load short circuit); (4) The battery can be charged and discharged by the MOS tube; (5) Wide operating temperature range: -40 Â ° C ~ +85 Â ° C; (6) Low current consumption Module description: Â · B+ is connected to the battery positive pole; Â · MB connects the contacts in battery 1 and battery 2; Â · B- is connected to the negative pole of the battery; Â · P+ is connected to the positive terminal of the charge/discharge terminal (the charge terminal/discharge terminal is shared); Â · P- Connect the charge/discharge terminal negative (common to the charge/discharge terminal). Precautions: 1. Please pay attention to the input and output voltage and load current.1 7.4V 2 String 18650 Lithium Battery Protection Board. Although the protection board has an anti-static protection circuit built in, do not apply excessive static electricity to the protection board beyond the performance of the protection board circuit.