IMAX B3 LiPo battery balance charger — 2S and 3S, 7.4V and 11.1V

The IMAX B3 is a compact, AC-powered LiPo battery balance charger designed specifically for 2S (7.4V) and 3S (11.1V) lithium polymer battery packs. It charges each cell individually through the balance connector, ensuring all cells reach the same voltage (4.20V ±0.05V per cell) for safe, balanced charging without requiring a separate power supply or complex settings. Simply plug into a wall socket and connect your LiPo pack — the B3 handles the rest.

Key Specifications:

• Input voltage: AC 100V – 240V (universal mains)
• Compatible battery types: LiPo, Li-ion, LiFe (2S and 3S only)
• Cell count: 2S (7.4V) and 3S (11.1V)
• Charge current: ~400mA per cell (2S), ~350mA per cell (3S)
• Charge cutoff voltage: 4.20V ±0.05V per cell
• Connector: JST-XH balance connector (2S: 3-pin, 3S: 4-pin)
• Charge indication: LED per cell (red = charging, green = full)
• No power supply required — plugs directly into AC mains
• Dimensions: ~75mm × 45mm × 30mm

LED Indicators:

• Red LED: cell is charging
• Green LED: cell is fully charged
• All green: pack is fully balanced and charged — safe to disconnect

Compatible Battery Packs:

• 2S LiPo (7.4V) — connect to 3-pin JST-XH balance port
• 3S LiPo (11.1V) — connect to 4-pin JST-XH balance port
• Not compatible with 1S, 4S, or higher cell count packs

Applications:

• RC cars, trucks, and buggies
• RC aircraft and fixed-wing planes
• FPV drones and quadcopters (2S/3S)
• RC boats and watercraft
• Portable LiPo-powered electronics

Safety Notes:

• Never leave charging LiPo batteries unattended
• Do not charge damaged, swollen, or punctured LiPo packs
• Charge on a fireproof surface or in a LiPo-safe bag
• The B3 charges at a low C-rate — charge times are longer than dedicated balance chargers (e.g. IMAX B6)