Battery equalizer for series battery systems. Keeps voltages balanced between seriesconnected batteries to improve performance and extend service life. Key benefits Prevents singlebattery overcharge or deep discharge by transferring energy from highervoltage cells to lowervoltage cells. Automatically detects small voltage differences and equalizes without manual intervention. Reduces premature battery failure caused by repeated imbalance during charge and discharge cycles. Low standby consumption with touch switch on versions to minimize selfdraw. Models and functions HC01 Battery Balancer Designed for 12V leadacid batteries connected in series. Detects a voltage difference of 20 mV between two 12V batteries and begins balancing. Balancing method: shunts current from the highervoltage battery to the lowervoltage battery until voltages converge. Suitable for multiunit systems composed of 12V batteries, such as 24V, 36V, and 48V systems, by applying HC01 units across individual battery pairs as needed. version includes a touch switch to reduce standby selfconsumption. Nominal battery voltage: 2 x 12V Optimized balancing current: 0 to 5 A HC02 Battery Equalizer Energy transfer type equalizer for batteries connected in series or parallel. Works with leadacid (VRLA), lithium iron phosphate (LFP), nickelcadmium (NiCD), and nickelmetal hydride (NiMH) batteries. Starts equalizing when the voltage difference reaches 10 mV. Can be connected 24 hours a day for automatic maintenance of energy balance. Operates on a single battery voltage range of 7 V to 18 V and can connect up to four batteries at a time. If fewer than four batteries are used, unused wires may be left insulated and not connected. version adds a touch switch to reduce standby selfconsumption. Optimized balancing current: 0 to 10 A Quiet current: 5 mA with LED off Common specifications Protection: reverse polarity protection Display: LED tube display Materials: ABS housing Color: black Dimensions: 62 x 124 x 27 mm Wiring note: Red wire to battery positive, black wire to battery negative. When connecting multiple batteries follow the indicated wiring; connection is not limited. Insulate or secure unused wires to avoid short circuits. Practical use scenarios Solar offgrid battery banks: Install between adjacent 12V batteries in a 24 V or 48 V string to maintain balance during varied charge and load conditions. Backup power systems: Keep backup batteries at equal voltages to avoid one battery aging faster during regular float charging and occasional discharges. Mobile or telecommunications battery banks: Maintain even state of charge among batteries in series to improve reliability and reduce maintenance. Package contents 1 x Battery equalizer (HC01 or HC02, selectable) Installation and operation tips Verify battery chemistry compatibility before connecting HC02. Ensure correct polarity when connecting red and black wires. Place the device where it is dry and secure, and avoid direct exposure to heat sources. The device may remain connected continuously for automatic balancing during charge, discharge, and idle periods. This equalizer provides automatic, continuous voltage balancing for seriesconnected battery systems, reducing imbalance and helping to prolong overall battery service life.