Short circuit protection Overcharge protection Over-discharge protection Overcurrent protection Overcharge Detection Voltage: 4.25-4.35V ± 05 V Over Discharge Detection Voltage: 2.3-3.0V ± 05 V Maximum Working Current: 3A Temporary Current: 5A Operating temperature: -40-50 degrees Internal resistance: less than 45 m Ω B + B-: Battery core interface P + P-: board battery connector MB: the connection point between the batteries B +: V + Positive battery B-: Battery V Negative P +: Output / Charging V + P-: Output / Charging V Size: Approx. 36x6x1mm / 1.42 "x 0.24" x 0.04 "