Compensation board for capacitive energy transfer with high precision 5 mV, providing total group equalization and no adjacent equalization. Working voltage is 1.8 V to 4.5 V, suitable for ternary lithium, lithium iron phosphate (LiFePO4), and lithium titanate (LTO). Working principle: the capacitor fit transmits the charge carrier, and the balance board is connected to the battery to start balancing. It uses a brand new MOS with ultra-low internal resistance, a 2 oz copper thickness PCB, and the balance current is 0-5.5 A. The more balanced the battery, the smaller the current. Upgrade version: compensation board for capacitive energy transfer (upgrade version). Use scenarios - In multi-cell packs for electric vehicles or power tools, it achieves precise, uniform cell voltages across groups with minimal adjacent imbalance. - In stationary energy storage or solar systems using LiFePO4 or LiTiO2/LTO chemistries, it maintains balance and overall pack health. - In DIY battery packs or portable devices requiring accurate 5 mV cell balancing and scalable current handling from 0 to 5.5 A.