Tenergy Protection circuit Module (PCB) for 3.7V Li-Polymer Battery (15A cut-off) Protection Circuit Board for 3.7V Li-ion and Li-polymer battery pack Designed for 3.7V Li-ion or Li-Polymer battery Prevents 3.7V Li-ion or Li-polymer battery from over-charging, over-discharging,and from discharging current more than 15A. Dimension (L x W x H) 28 x 7 x 2.45 mm Compatible with both Li-ion and Li-Polymer cells