2S 7.4V 8.4V 10A 18650 Lithium Battery BMS Protection Board

2S 7.4V 8.4V 10A 18650 Lithium Battery BMS Protection Board is a compact high-current 2-series (2S 7.4V nominal / 8.4V full charge) Battery Management System (BMS) strip designed for 2-cell 18650, 21700, and 26650 lithium-ion battery packs. Delivering 5A–8A continuous working current and up to 10A peak current in a slim 45mm × 15mm footprint, it provides per-cell overcharge (4.25V), over-discharge (2.50V), overcurrent, and fast `<250µs` short-circuit protection with automatic recovery.

Key Features:

• 2S (7.4V / 8.4V) 10A High-Current Rating: Supports 5A–8A continuous discharge and 10A peak current—ideal for 7.4V RC vehicles, robotics motors, and high-power LED lights where 3A–4A 2S boards trip.
• Independent Per-Cell Voltage Monitoring: Monitors Cell 1 and Cell 2 individually via the `BM` (`B1`) center tap to block overcharging above 4.25V ±0.05V and deep discharge below 2.50V ±0.10V.
• Ultra-Fast <250µs Short-Circuit Protection: Cuts off output MOSFETs in less than 250 microseconds during a load short circuit and recovers automatically.
• Slim 45×15mm Strip Profile: Narrow PCB tucks directly into the valley between two side-by-side 18650 cells inside heat-shrink wrap.
• Low Quiescent Current: Draws less than 10µA in standby to preserve battery capacity over long shelf periods.

Technical Specifications:

• Supported Battery Configuration: 2S (2 Series 3.7V Li-ion / 18650 / 21700 / LiPo Cells — 7.4V Nominal)
• Charging Voltage: 8.4V to 9.0V DC CC/CV
• Continuous Working Current: 5A to 8A Continuous
• Peak / Instantaneous Current Limit: 10A Max
• Overcharge Detection Voltage: 4.25V ± 0.05V per cell (Release: 4.15V ± 0.05V)
• Over-Discharge Detection Voltage: 2.50V ± 0.10V per cell (Release: 3.00V ± 0.10V)
• Short-Circuit Detection Delay: < 250 µs
• Quiescent Current: < 10 µA | Internal Resistance: < 30 mΩ
• Operating Temperature Range: -40°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Fiberglass Strip PCB
• Terminals: 5 × Tinned Solder Pads (`B+`, `B-`, `MB`/`B1`, `P+`, `P-`)

Dimensions:

• Length: 45.0 mm
• Width: 15.0 mm
• Thickness: ~3.0 mm
• Weight: ~4.5 g

Pinout and Wiring:

• B- (0V): Connect to Cell 1 Negative terminal.
• MB / B1 (3.7V): Connect to the series junction between Cell 1 Positive and Cell 2 Negative.
• B+ (7.4V/8.4V): Connect to Cell 2 Positive terminal.
• P+ & P-: Output/input terminals to 7.4V load and 8.4V CC/CV charger.
• First-Use Wake Note: After soldering the cells in sequence (`B-` → `MB` → `B+`), briefly apply 8.4V charger power across `P+`/`P-` to activate output voltage.

Datasheet Reference:

• Protection Architecture: 2S Lithium-Ion Protection IC + High-Current Dual N-Channel MOSFET Bank

Commonly Used in:

• 7.4V 2S 18650 RC Cars, Boats, and Robotics Drive Packs
• 7.4V Portable Bluetooth Boomboxes and Guitar Amplifiers
• 8.4V Bicycle Headlights and Camping Searchlights
• 9V / 12V Dual-Output Router Mini-UPS Battery Packs

Applications:

• Builds protected 2S1P or 2S2P 7.4V 18650 battery packs for Arduino 4WD robot chassis, servo arrays, and RC transmitters.
• Provides 10A peak startup capability for 7.4V mini air pumps, handheld vacuums, and cordless trimmers.
• Fits inside standard 2-cell 18650 battery cases or PVC heat-shrink sleeves.

Equivalent Models:

• HXYP-2S-A18 2S 7.4V 8.4V 4A Li-ion 18650 Battery BMS Protection Board: Lower-current 4A 2S BMS module for light electronic loads.
• HX-3S-FL10A 3S 11.1V 12.6V 10A Lithium Battery BMS Protection Board: 3-cell (11.1V/12.6V) 10A BMS module.

Package Includes:

• 1 × 2S 7.4V 8.4V 10A 18650 Lithium Battery BMS Protection Board