2S 7.4V 20A Li-ion BMS Protection Board — 18650, Balanced, 10A Charge, 45×15mm

2S 7.4V 20A Li-ion BMS Protection Board — 18650, Balanced, 10A Charge

This 2S BMS (Battery Management System) protects a 2-cell series lithium-ion battery pack (7.4V nominal, 8.4V fully charged) from overcharge, overdischarge, and overcurrent — with cell balancing to equalize charge between the two cells. Designed for 18650, 26650, and polymer Li-ion cells. The 20A continuous discharge and 10A charge rating suits power tools, e-bikes, and high-drain portable devices. Available in standard (45×15mm) and balancing (48×20mm) versions.

Protection Specifications

• Configuration: 2S (2 cells in series)
• Nominal Voltage: 7.4V (2 × 3.7V)
• Full Charge Voltage: 8.4V (2 × 4.2V)
• Charging Voltage: 8.4V – 9.0V
• Continuous Discharge Current: 20A
• Continuous Charge Current: 10A
• Cell Balancing: Yes (passive balancing)
• Compatible Cells: 18650, 26650, polymer Li-ion (3.7V nominal / 4.2V full)
• Dimensions (Standard): 45 × 15 × 3.4mm
• Dimensions (Balancing): 48 × 20 × 3.4mm

2S BMS Applications

• 2S 18650 pack = 7.4V — common for RC cars, drones, and power tools
• Balancing version recommended for long-term cycling to prevent cell imbalance

Typical Applications

• DIY 7.4V power tool battery pack
• 2S LiPo RC car and drone battery protection
• Portable 7.4V power bank
• E-bike 7.4V auxiliary battery
• High-drain 2S Li-ion pack protection

2S 7.4V 20A BMS protection board — 18650, balanced, 20A discharge, 10A charge, overcharge/overdischarge/overcurrent for DIY power tool and drone battery packs.

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