Battery Voltage Balancer (HC02) What it does This compact voltage balancer maintains equal charge across seriesconnected batteries to reduce overcharging and undercharging during charging and discharging cycles. It operates continuously without manual intervention to keep multibattery systems balanced and stable. Key benefits Keeps batteries evenly charged to prevent individual cell overcharge or deep discharge during cycling. Supports continuous 24/7 operation for reliable, unattended voltage balancing. Low standby power draw thanks to an updated touchsensitive switch and 5 mA quiescent current in the HC02 model when the LED is off. Fast current transfer capability (0 to 10 A) to correct imbalances efficiently. Builtin protections for reverse polarity and low voltage conditions to improve system reliability and conversion performance. Compact dimensions (62*124*27 mm) for easy installation in confined spaces. Features and specifications Model: HC02 Compatible battery chemistries: Acid VRLA, Lithium Iron Phosphate LFP, Ni/, and Ni/MH System voltages: Works with 24 V and 48 V configurations Connection: Can connect up to 4 batteries simultaneously; extra wires may be left unconnected safely without affecting functionality Monitoring threshold: Balances voltage differences automatically, with monitoring starting at a 7 V activation threshold Activation and transfer: Energy transfer activates when the voltage difference reaches 10 V between cells, redirecting current from the highervoltage side to the lowervoltage side until balance is achieved Current transfer range: 0 to 10 A Quiescent current: 5 mA when LED is off Controls: Touchsensitive switch to reduce standby consumption Protections: Reverse polarity protection and low voltage protection below 10 V Why you need it Prevents imbalancerelated failures by equalizing charge across cells in series packs. Reduces manual maintenance and monitoring by providing automated, continuous balancing. Minimizes energy loss from uneven cells by redirecting charge where it is needed, improving overall system performance. Fits into tight installations where space is limited thanks to its small footprint. Typical applications Offgrid solar battery banks: Maintain balanced charge across 24 V or 48 V battery strings made from VRLA or LFP cells. Backup power systems and UPS: Keep multibattery backup arrays balanced and ready for reliable discharge when needed. Electric mobility and hobbyist battery packs: Balance packs built from LFP, Ni/, or Ni/MH cells to reduce the risk of cell mismatch during use. Installation and operation notes Ensure correct polarity during installation to avoid triggering reverse polarity protection. The device begins monitoring at 7 V and will transfer current when imbalances reach the 10 V activation threshold. Up to four batteries can be connected at once; any unused wires can remain unconnected without impacting operation. The touchsensitive switch reduces standby consumption; when the LED is off the HC02 draws only 5 mA. This voltage balancer provides a compact, lowpower solution for automatically maintaining balanced charge across series battery systems while offering protections and broad compatibility with common battery chemistries and system voltages.