Features: Ensure safety and longevity of your lithiums batteries with the 4Pcs 1S 3.7V 3A Lithiums Battery Protections Board, design to prevent overcharge, overdischarge, short circuits, and overcurrent issue. This protections board features robusts design that withstands high temperatures and humidity, ensuring reliable performances for 18650 batteries. Ideal for electronics enthusiasts and DIY hobbyists, this module is perfect for anyone look to enhances their battery management systems. Whether you're working on small battery pack or intricate DIY projects, this compactly protections board integrates seamlessly into various applications. With its easy wiring instructions, setting up your battery protections system have never been more straightforward, making it essential component for any battery powered project. Specifications: Component:Plastic Size:Approx.30x3.7mm/1.18x0.14inch for 18650 Lithiums Batteries Charging Module; Overcharge Detection Voltages:3.75±0.05V; Overcharge Release Voltages:3.75±0.05V; Overdischarge Detection Voltages: 2.1±0.1 V; Overcharge Detection Current:1-3A Package Includes: 4pcs 1S 3.7V 18650 Lithiums Battery Protections Board note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.