4S 20A BMS Li-ion Battery Protection Board HX-4S-D20

4S 20A BMS Li-ion Battery Protection Board HX-4S-D20

The HX-4S-D20 is a high-quality 4-series lithium-ion battery protection board (BMS) designed to safeguard your 14.8V battery packs from overcharge, over-discharge, and overcurrent. Whether you're building a DIY power bank, e-bike battery, or robotics power system, this compact BMS delivers reliable protection with a 20A continuous current rating.

Key Features

• 4S configuration: supports 4 series-connected Li-ion/LiPo cells
• Nominal voltage: 14.8V (supports 3.7V, 7.4V, 11.1V cell taps)
• Continuous discharge current: 20A
• Overcharge protection per cell
• Over-discharge protection per cell
• Overcurrent and short-circuit protection
• Balance taps: B1, B2, B3 for cell voltage monitoring
• Output terminals: P+ and P- for load connection
• Compact square PCB with rounded corners for easy integration
• PCB revision: REV 1.1

Specifications

• Model: HX-4S-D20
• Cell configuration: 4S (4 series)
• Nominal pack voltage: 14.8V
• Max continuous current: 20A
• Overcharge voltage: ~4.25V per cell
• Over-discharge voltage: ~2.5V per cell
• PCB color: Green
• MOSFETs: D403 (x4)Applications

• DIY 14.8V lithium battery packs
• E-bike and electric scooter batteries
• Robotics and drone power systems
• Solar energy storage
• Power tool battery replacements 
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