IMAX B3AC 2S/3S LiPo Balance Battery Charger

IMAX B3AC 2S/3S LiPo Balance Battery Charger is a compact, mains-powered automatic balance charger engineered specifically for 2-cell (2S 7.4V) and 3-cell (3S 11.1V) Lithium Polymer (LiPo) battery packs. Incorporating an internal 100V–240V AC switching power supply and three independent precision cell-balancing channels (up to 850mA per cell), the IMAX B3 Pro charges each individual cell through its JST-XH balance lead to ensure uniform 4.20V termination across the entire battery pack. Three dedicated bi-color LED indicators provide real-time per-cell charging status for RC drones, quadcopters, airsoft guns, and robotics battery packs.

Key Features:

• Independent 2S & 3S Balance Ports: Dedicated 3-pin (2S 7.4V) and 4-pin (3S 11.1V) JST-XH balance sockets charge each cell individually.
• Built-In Universal AC Power Supply: Connects directly to 100V–240V AC (50/60Hz) household mains via the included AC power cord—no external adapter required.
• 3 × 850mA Fast Balance Current: Upgraded 20W internal power stage delivers up to 850mA per cell channel for rapid, balanced replenishment.
• Tri-LED Cell Status Display: Three dual-color (Red/Green) LEDs independently indicate charging status for Cell 1, Cell 2, and Cell 3.
• Automatic 4.20V Cut-off & Protection: Built-in short-circuit, overcharge, and reverse-polarity protection automatically stops charging when cells reach 4.20V.

Technical Specifications:

• Model: IMAX B3 Pro / B3AC 20W Compact Balance Charger
• Input Supply Voltage: 100V to 240V AC, 50Hz / 60Hz
• Supported Battery Chemistry: 2S (7.4V) and 3S (11.1V) Lithium Polymer (LiPo) / Li-ion Packs
• Maximum Output Power: 20 W
• Balance Charge Current: 3 × 800mA to 850mA max per cell
• Cell Termination Voltage: 4.20V ± 0.02V per cell
• Status Indicators: 3 × Bi-Color LEDs (Orange/Red = Charging; Solid Green = Full/Standby)
• Operating Temperature Range: 0°C to +45°C

Mechanical Specifications:

• Enclosure Material: Flame-retardant ABS insulated plastic casing with ventilation slots
• Input Socket: IEC C7 Figure-8 2-pin AC mains power inlet
• Balance Connectors: 1 × 3-pin JST-XH (2S) socket, 1 × 4-pin JST-XH (3S) socket
• Weight: Approximately 100 grams (excluding AC cord)

Dimensions:

• Length: 92.0 mm
• Width: 59.0 mm
• Height: 35.5 mm

Pinout and Wiring:

• AC Power Socket (Rear): Connect the supplied AC mains cord to a 100V–240V AC wall outlet (All 3 LEDs turn green in standby).
• 2S Balance Port (3-Pin Front): Plug in the 3-pin JST-XH balance plug of a 7.4V 2S LiPo battery (CELL1 and CELL2 LEDs turn red while charging).
• 3S Balance Port (4-Pin Front): Plug in the 4-pin JST-XH balance plug of an 11.1V 3S LiPo battery (All 3 LEDs turn red while charging, turning green as each cell finishes).
• Safety Notice: Never charge a 2S and a 3S battery simultaneously on both ports at the same time.

Datasheet Reference:

• Refer to the IMAX B3 Pro 20W LiPo Balance Charger User Manual for LED diagnostic blink codes and safety precautions.

Commonly Used in:

• RC quadcopters, FPV racing drones, helicopters, and fixed-wing RC airplanes
• 2S 7.4V and 3S 11.1V airsoft AEG and gel-blaster LiPo battery packs
• Autonomous combat robots, line-following bots, and university robotics platforms
• Portable 12V (3S) DIY lithium battery packs with JST-XH balance leads

Applications:

• Precision Cell Balancing: Eliminating cell voltage drift in multi-cell 2S and 3S LiPo packs without complex menu setup.
• Field & Bench Charging: Plug-and-play AC wall charging for hobbyists and educational robotics labs.
• Battery Lifespan Extension: Preventing individual cell overcharging during routine recharge cycles.

Equivalent Models:

• IMAX B6AC 80W Digital Balance Charger: Programmable microprocessor charger supporting 1S–6S LiPo/LiFe/NiMH with LCD display and discharge modes.
• ToolkitRC / ISDT Smart Balance Chargers: High-power DC input balance chargers for high-capacity drone packs.
• 3S 2A Step-Down/Boost Charger Module: Bare PCB charger module for internal 3S 12.6V pack integration.

Package Includes:

• 1 × IMAX B3AC 2S/3S LiPo Balance Battery Charger
• 1 × AC Mains Power Cord