Features The MOS tube can control the charge and discharge of the battery, and the standby current consumption is low. High accuracy voltage detection circuit, exquisite workmanship for maximum durability and convenient size. Over discharge protection, over current protection, over charge protection, high charge and discharge current. Suitable for electric drills with starting current below 20A and power below 170W. With balance charging function. Suitable for lithium batteries with a nominal voltage of 3.7V and a full voltage of 4.2V (including 18650, 26650, Li‑Polymer, no size limit). Specification: Item Type: Lithium Battery Protection Board Material: PCB Balance Function: Yes Wiring Mode: Same Port Cell: LiNiCoMnO2 25.2V Main Circuit Conduction Internal Resistance: ≤20MΩ Application: Suitable for lithium batteries with a nominal voltage of 3.7V and a full voltage of 4.2V (including 18650, 26650, Li‑Polymer, no size limit). Package List:1 x Protection Board Package List 1 x Protection Board