Features: Protection circuit board is the heart of battery pack, must to have to avoid battery pack from explosion, fire and damage. It will protect battery pack from overcharging, over-discharging over-current and short circuit. With equilibrium function to keep each cell in balance and good service life. This protection board is used for 7 series 24V Lithium batteries, comes with wire. Choosing the correct protection board and applying it appropriately is vital to the longevity your batteries. Specifications: Size: 90mm*47mm*10mm / 3.54*1.85*0.39" Equalizing Current: 80mA (VCELL=4.20V) Equalizing Point: 4.18±0.03V Overcharge Threshold: 4.3±0.05V Overcharge Time Delay: 75mS Overcharge Release: 4.05±0.05V Over-discharge Threshold: 2.4±0.08V Over-discharge Time Delay: 5mS Over-discharge Release: Disconnect load, and voltage of each battery cell is higher than over-discharge threshold Over-current Threshold: 40A Over-current Release: Disconnect load release Working Current; 20A Quiescent Power Dissipation: < 500uA Short Circuit Protection: Yes, disconnect load can self-recovery Package Includes: 1 x Battery Protection Board