battery equalizer, dedicated for 2 24V batteries, aluminum alloy shell BM202S battery equalizer is used to maintain the charge and discharge balance between each battery in a battery pack connected in series. During the operation of the battery connected in series, the chemical composition and temperature differences of the battery cells will cause differences in the charge and discharge of the two batteries. Even when the battery is idle, the self-discharge degree will be different, which will cause imbalance between the batteries connected in series. Product Features: ) 100CM extension cable with M8 terminal High-precision chip can reduce voltage deviation LED indicator display Ultra-fast balancing connection Support combination of multiple modules @ Aluminum alloy shell, better heat dissipation performance Suitable for installation in 2 series 24V lead-acid batteries or lithium battery packs Product Installation: . Red wire connects the positive pole of the battery and the black wire connects the negative pole. . Connect multiple batteries as above. . Unused battery wires are handled well to avoid short circuits. Please read the instruction manual before installing the device! Before connecting the battery equalizer, please confirm the positive and negative terminals of the battery pack to avoid short circuit and reverse connection between the battery equalizer terminals. Package included: 1 x BM202S battery equalizer