The protection board is for 5 series Li-ion batteries, mainly used for electric power vehicles. It uses a special IC for 5S lithium batteries as a processor to detect the voltage, charging and discharging current, and temperature of each battery in real time. Various stable protection functions for charging and discharging, such as overcharge protection, over-discharge protection, and short-circuit protection. Low power consumption, the working current is about 25uA, and the sleep current is about 6uA. Choosing the protection board and applying it correctly is crucial for the lifespan of batteries. Charging voltage: 19 / 21V; Single cell charging voltage: 3.8/4.25V; Continuous discharge current: 8-20A Single cell overcharge detection voltage: 3.85-4.25V Overcharge protection delay: 1S Single cell overcharge recovery voltage: 3.75-4.13V Overcharge protection release time: 1mS Single cell over-discharge detection voltage: 2-2.8V Over-discharge protection delay: 1S Single cell over-discharge recovery voltage: 2.5-3.0V Over-discharge protection release time: 100 +/- 20mS Overcurrent detection voltage: 0.1-0.4V Overcurrent detection: 100 +/- 20mS Overcurrent detection voltage... Overcurrent: 30 +/- 5A Overcurrent detection delay: 1S Recovery mode: Auto Short circuit protection: Support Yes Short circuit detection delay: 1S Short circuit detection voltage: 0.8V Protection temperature: 70 +/- 5 degrees Recovery temperature: 55 +/- 5 degrees Internal resistance of the main discharge circuit: 30 +/- 5m ohm Operating temperature: -40 degrees-85 degrees less than or equal to 75% Type: Dual MOS Color: Green Material: Plastic Size: 46x40mm / 1.81x1.57 inches Package Contents: 3 x Battery Protection Boards Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.