Description: 2S 7.4V 8.4V 18650 BMS 20A Lithium Battery Protection Board

Upgrade your lithium-ion battery packs with this 2-string (2S) 7.4V/8.4V 20A Battery Management System (BMS). Designed specifically for 18650 cells, this BMS offers robust protection against overcharge, over-discharge, overcurrent, and short circuits. Optional balanced charging ensures that each cell charges evenly, improving battery lifespan and performance.

With a continuous discharge current of up to 20A, it’s ideal for high-drain applications such as electric bikes, power tools, solar power systems, and DIY battery projects. Its compact design makes it easy to integrate into custom builds, while advanced MOSFETs and efficient circuitry offer reliable and safe performance. Whether you’re building a new battery pack or upgrading an old one, this BMS provides the protection and balance your cells need.

✅ Specifications

• Battery Type 18650 Lithium-Ion
• Configuration 2S (2 Strings in Series)
• Voltage 7.4V nominal / 8.4V fully charged
• Continuous Current 20A
• Balanced Charging Optional
• Protection Overcharge, Overdischarge, Short Circuit, Overcurrent, Temperature
• Dimensions Approx. 45mm x 20mm x 3mm
• Weight Approx. 10g
• PCB Type Double-sided, high-quality PCB
• Usage E-bike, power tools, solar storage, DIY packs

✅ Key Features

• Supports 2S 18650 lithium battery packs (7.4V–8.4V)
• 20A discharge capacity for high-current applications
• Optional balance function extends battery life
• Multi-layer protection (overcharge/discharge/short circuit)
• Compact, lightweight, and easy to install
• Built-in temperature protection with auto recovery
• High-performance MOSFETs for safe operation
• Durable PCB for long-term reliability
• Ideal for e-bikes, solar energy, and DIY battery projects

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Package Included

1x 2S 7.4V 8.4V 18650 BMS 20A Lithium Battery Protection Board