HC02 Battery Equalizer / Battery Balancer — 4S Li‑ion with Digital Display Keep a 4S Li‑ion battery pack healthy, safe, and performing at its . The HC02 battery equalizer is designed for 4S Li‑ion battery packs and provides clear, real‑time cell information with a built‑in digital display. It helps prevent cell imbalance, reduces the risk of premature capacity loss, and makes routine battery maintenance quick and easy. Key benefits Maintains balanced cell voltages across a 4S Li‑ion pack, reducing stress on individual cells and helping preserve overall pack capacity. Digital display gives immediate visibility into each cell's voltage so you can spot imbalances or weak cells without external testers. Simple to integrate with existing 4S battery packs for better charging consistency and safer operation. What it does Monitors the voltages of all four series cells and displays each cell's voltage on the digital readout. Actively balances or equalizes cell voltages (battery balancer functionality) to reduce voltage differences between cells and improve pack reliability. Helps support safer charging and longer usable life for Li‑ion battery assemblies by preventing overcharging of higher‑voltage cells. Key attributes Model: HC02 — specifically designed for 4S Li‑ion battery packs. Compatibility: Works with 4S Li‑ion battery configurations (four cells in series). Digital display: Integrated readout provides per‑cell voltage readings for quick diagnostics. Form factor: Compact design suitable for integration into battery packs or mounting near the balance lead area. Construction: Built for regular use with a durable housing suitable for workshop, hobby, or field environments. Performance: Balances cell voltages to reduce imbalancerelated degradation and supports consistent charging behavior. Customerfocused features Easy monitoring: Read individual cell voltages at a glance on the digital display. Preventive maintenance: Identify weak or mismatched cells early to avoid pack failure or reduced run time. Compatibility with standard 4S balance leads for straightforward installation. Typical applications Remote control models and multirotor drones that use 4S Li‑ion packs and require reliable cell balancing and monitoring. DIY battery packs and portable power projects where maintaining even cell voltages extends usable life and performance. Small electric vehicles, scooters, or e‑tools built from 4S Li‑ion cells that benefit from accessible cell diagnostics and balancing. Usage notes Designed for 4S Li‑ion battery packs; confirm your pack configuration matches 4S before use. Connect to the pack's balance lead so the display can read each cell voltage and the balancer can equalize cells as intended. Regular use during charging and periodic checks during storage can help maintain pack health. The HC02 Battery Equalizer (Battery Balancer) for 4S Li‑ion with Digital Display provides clear, practical cell monitoring and balancing in a compact package — a straightforward tool to help protect and prolong your 4S Li‑ion battery packs.