3S 12V 6A Li-ion / LiPo BMS Protection Board — 18650, 11.1V, Overcharge/Overdischarge

3S 12V 6A Li-ion / LiPo BMS Protection Board — 18650, 11.1V

This 3S BMS (Battery Management System) protects a 3-cell series lithium-ion or LiPo battery pack (11.1V nominal, 12.6V fully charged) from overcharge, overdischarge, and overcurrent. Designed for 18650 cell packs used in power tools, e-bikes, portable power stations, and DIY battery systems. The compact 50×16mm PCB fits inside most battery enclosures.

Protection Specifications

• Configuration: 3S (3 cells in series)
• Nominal Voltage: 11.1V (3 × 3.7V) | Full Charge: 12.6V (3 × 4.2V)
• LiPo Voltage: 10.8V (3 × 3.6V nominal)
• Max Working Current: 4–5A continuous
• Max Peak Current: 6–7A
• Overcharge Protection: 4.25–4.35V per cell
• Overdischarge Protection: 2.3–3.0V per cell
• Working Temperature: -40°C to +50°C
• Storage Temperature: -40°C to +80°C
• Standby Current: 6μA
• Internal Resistance: <45mΩ
• Dimensions: 50 × 16 × 1.0mm

3S BMS Cell Configuration

• 3 × 18650 cells in series = 11.1V nominal / 12.6V full charge
• Each cell individually monitored for overcharge and overdischarge
• Common 12V tool voltage (compatible with 12V power tool ecosystem)

Typical Applications

• DIY 12V power tool battery pack (drill, screwdriver)
• 3S LiPo drone battery protection
• Portable 12V power station
• E-bike 12V auxiliary battery
• Solar energy storage 3S Li-ion pack

3S 12V 6A BMS protection board — 18650, 11.1V, overcharge/overdischarge/overcurrent protection, 50×16mm for DIY power tool battery packs and portable power systems.

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