Active equalizer / balancer board for multi-cell lithium battery packs — designed to keep cells matched, extend battery life, and maximize usable capacity. Key benefits Accurate cell balancing: Maintains cell voltages within 5 mV to reduce cell mismatch and capacity loss over time. Faster, more efficient energy transfer: Flying-capacitor transfer method moves charge between cells efficiently, lowering energy waste during balancing. Protects battery health: Built-in under-voltage sleep prevents over-discharge of the monitored section and minimizes standby drain. Low-loss construction for reliable performance: Ultra-low internal resistance and 57 g copper thickness support stable, consistent balancing under load. What it does Actively redistributes charge between cells to equalize voltages, so batteries age more evenly and deliver more consistent performance. Uses a flying capacitor transfer charge transporter to perform balance operations with high transfer efficiency and low internal loss. Automatically enters a low-power sleep mode when the B1 section voltage drops below 7 V, reducing standby current to less than 0.1 mA. Compatibility and performance Designed for ternary polymer-lithium batteries and lithium-iron-phosphate (LiFePO4) batteries. Operating voltage range: 7 V–4.2 V. Balance current range: 0–5.5 A, with design emphasis on controlling smaller balancing currents for precise balancing. Voltage accuracy: within 5 mV for fine, reliable cell matching. Build and materials Ultra-low internal resistance for efficient energy flow during balancing. 57 g copper thickness in PCB traces for improved current capacity and thermal stability. Practical applications (examples) E-bike and electric scooter battery maintenance: Keep multi-cell packs balanced to improve range consistency and extend pack life. DIY battery pack assembly and repair: Integrate into custom packs that use ternary polymer or LiFePO4 cells to ensure safe, even performance across cells. Stationary energy systems and backup power: Maintain long-term health of battery arrays used in small solar or UPS systems. Technical highlights at a glance Product type: Active equalizer / balancer board Compatible chemistries: Ternary polymer-lithium, Lithium-iron-phosphate (LiFePO4) Operating voltage: 7 V–4.2 V Balance current: 0–5.5 A (focus on lower currents) Voltage accuracy: within 5 mV Under-voltage sleep: activates when B1 section < 7 V; standby < 0.1 mA Construction: ultra-low internal resistance, 57 g copper thickness Use this active equalizer where precise, efficient cell balancing and battery-health protection are required.