12V 4S 20A BMS Lithium Battery Protection Board With Balance

Your lithium battery pack deserves more than luck — it deserves a smart guardian that never sleeps. The amiciKart 12V 4S 20A BMS Lithium Battery Protection Board is engineered to keep your battery pack safe, balanced, and performing at its best — whether you're building an e-bike, a solar storage unit, or a custom DIY electronics project.

This BMS board actively monitors every cell in your 4S lithium-ion or LiPo pack, stepping in the moment something goes wrong. It blocks overcharging before it damages your cells, prevents over-discharging that kills battery capacity, and cuts off short circuits instantly to protect both your battery and your device. With a robust 18A continuous current rating and 30A surge handling, it comfortably powers high-demand applications without breaking a sweat. The built-in 40mA passive cell balancing automatically equalises voltage across all four cells, eliminating weak-cell syndrome and extending your pack's overall lifespan.

What makes this board stand out is its self-healing auto-reset protection — if a fault is triggered, the board recovers on its own once the condition clears. No manual reset, no downtime, no frustration. It's plug-and-play for makers, hobbyists, solar enthusiasts, and e-bike builders who want reliability without complexity.

Backed by a 1-year warranty and real human support via WhatsApp, call, or email (📞 980-970-9898 | ✉️ care@amicikart.com), amiciKart ensures you're never left troubleshooting alone. Ships free across India with same-day dispatch for orders placed before 2 PM.

• Stay Safe from Battery Damage – Protects your lithium-ion or LiPo pack against overcharging, over-discharging, and short circuits, keeping your batteries reliable for longer (triple-layer protection built-in)
• Handle Heavy Loads with Confidence – Supports up to 18A continuous current and 30A surge current, making it ideal for e-bikes, solar storage setups, and high-drain DIY electronics
• Automatic Cell Balancing for a Healthier Pack – Built-in passive balancing at 40mA evens out cell voltages across all 4 cells, preventing weak cells and extending overall battery life
• Self-Healing Auto-Reset – If a fault is triggered, the BMS resets itself automatically with no manual unplugging or intervention required, so your project keeps running smoothly
• Compatible with 4S Li-Ion & LiPo Packs – Works seamlessly with standard 4-cell lithium-ion and LiPo battery configurations, perfect for 12V DIY builds, e-bikes, and solar energy systems
• Free Shipping Pan-India + COD Available – Delivered across India in 3–5 business days with same-day dispatch on orders before 2 PM; pay via UPI, card, net banking, EMI, or Cash on Delivery
• 1-Year Warranty & Hassle-Free Support – Backed by a 1-year warranty and 30-day easy returns; reach our dedicated support team via WhatsApp, call, or email for fast assistance (📞 980-970-9898 | ✉️ care@amicikart.com)