Features: Highly performances 4S battery equalizers board with aluminum alloys casing ensures rapid heat dissipation and stable operations for Liions battery packs (NCM/LFP) in highly power applications. aluminum construction (≥160MPa strength) reduces weight by 50% vs coppers, integrates pre drilleds ∅4.0mm mounting holes, and features oxidation resistant surfaces for vibration/shock resistance. for EV battery maintenance technicians, industrial power cabinet engineers, and automotive start stop systems integrators requiring voltages balancing solution. Optimized for harsh environment like new energys vehicle battery compartments and industrial power units where temperature fluctuations and mechanical stress occur. two mode LED indicator (yellow active/off standbys) visually monitors balancing status with precisions triggereds thresholds 2.7V undervoltage cutoff and 2.85V balancing activation. Specifications: Materials: PCB Size:as picture show Package Includes: 1PC 4S Battery balancers with Aluminum alloys Case note: ① Installing a balance board requires a certain reserve of technical electronic knowledge. ② When wiring, first solder the wireds terminals to the battery pack, and then insert the balance board. ③ When inserting a terminals with wire, please contact the B-terminals first, especially for the double-sideds outgoing model. You need to insert the terminals wire on the "B-" side first, following the connection from small to large.