Features: 100% brand new and high quality. The protection board is designed for 5 series lithium-ion batteries, mainly used for power tools. It uses a special IC for 5S lithium batteries as a processor to detect the real-time voltage, charge and discharge current, and ambient temperature of each battery. Stable various 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 quiescent current is about 6uA. Choosing the right protection plate and using it appropriately is essential for the longevity of the battery. Specifications: Charge Voltage: 19/21V Single Cell Charge Voltage: 3.8/4.25V Continuous Discharge Current: 8-20A Overcharge Single Cell Detection Voltage: 3.85-4.25V Overcharge Protection Delay: 1S Overcharge Single Cell Recovery Voltage: 3.75-4.13V Overcharge Protection Release Delay: 1mS Overcharge Single Cell Detection Voltage: 2-2.8V Overcharge Protection Delay: 1S Overcharge discharge single cell recovery voltage: 2.5-3.0V Over discharge protection release delay: 100 ± 20mS Over current detection voltage: 0.1-0.4V Over current detection current: 30 ± 5A Over current detection delay: 1S Short circuit protection support: yes Short circuit detection delay: 250uS Short circuit release delay: 1S Short circuit detection voltage: 0.8V Recovery status: Auto when load disconnected Over circuit protection Temperature protection: 70 ± 5° Recovery temperature: 55 ± 5° Working condition: 25uA (25°) Standby state: 6uA(25°) Internal resistance of main discharge circuit: 30±5mOmega; Operating temperature: -40°-85°RHle; 75% Storage Temperature: -40°-125°RHle; 75% Size Length x Width: 45x4 0mm/1.77*1.57" Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1 × Charger Protection Board