Features: Ensure safety of your lithium batteries with our 4S 40A Lithium Battery Charger Protective Board, provide balance and Protective for 16.8V Cell Module. This Protective board features lightweight build, ensuring stable performances and durability for all your battery needs. Ideal for DIY enthusiasts, hobbyists, and professionals who work with lithium batteries, including 18650, 26650, and lithium batteries, without size limitations. Perfect for use in applications where the starting current is 80A and power is under 135W, such as in drill motors or other electronic projects requiring reliable battery management. With its low current consumption and multiple protections against over discharge, over current, and over charge, this board ensures efficient and safe charging and discharging cycles for your devices. Specifications: Component:Circuit Board Type:Reinforcing Plate/Equalizing Plate Size:Approx.4.5x6cm/1.77x2.36inch Package Includes: 1Pc Protective Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.