Specifications: Charging voltage: 21V Charge MOS pressure value: 35V Discharge MOS pressure value: 35V Charging current: 56A Continuous discharge current: 15A Over current protection: 50/55/60A Over current protection delay: 20/25/30mS Single power consumption: 30uA Power consumption between batteries: 3uA Single section over charge detection voltage: 4.18V- /4.22V Over charge recovery voltage: 4.05V- 4.15V Over charge detection delay: 0.5/1.0/2.0S Single section over discharge detection voltage: 2.75V-2.85V Over discharge recovery voltage: 2.90V-3.20V Over discharge detection delay: 0.5-2.0S Short circuit protection/Over current protection/Overload/Over discharge protection: disconnect load self-recovery Short circuit protection delay: 200/500/600uS The normal working state of B- to P- resistance: 5mΩ Continuous 15A current maximum temperature rise: 25°C Working environment (humidity) relative humidity: ≥98% (long-term stability under the humidity) Working environment (temperature) -30°C ~ +80°C (in the lower temperature range of long-term stability) Attention: When you wiring, please do it strictly according to the wiring diagram. Do not deliberately make it short circuit. Do not mix the good battery and poor battery to use. The internal resistance of 5 battery capacity are closer will be better. Package inlcuded: 4 x 5S 15A Lithium Battery Protection Board 4 x 6-Core Wire