Icom BP-279 F1000 Replacement Battery 7.4V 2250mAh

Icom F1000 Series — 7.4V Li-ion Replacement Battery (BP-279 / BP-280)

This 7.4V, 2250mAh Li-ion battery replaces the BP-279, BP-280, and BP-280LI packs used in the Icom F1000, F1000D, F1000S, F1000T, and over 22 additional F-series portable transceivers. It sits in the same housing footprint as the OEM pack and connects through the same gold contact strip. Capacity is rated at 2250mAh (16.65Wh) — drawn from our stock data, not estimated.

• F1000-series platform fit: The F1000, F1000D, F1000S, and F1000T all run the same 7.4V nominal voltage rail with identical connector geometry and BMS handshake protocol. One pack covers the full lineup because Icom standardised the battery interface across these variants — no pin remapping or adapter needed.
• Bench tested on actual hardware: We seated this pack in an F1000D and triggered repeated PTT cycles to simulate transmit current spikes. The BMS held without tripping on the inrush, and the charger dock advanced from fault to charge to full without manual intervention after the initial contact cycle.
• First insertion into the charger dock: If the dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Icom platform requires a clean contact cycle to complete the BMS handshake before the charger begins current flow — this is not a cell fault.

Why the F1000 cuts out mid-transmission on a freshly inserted pack

New Li-ion cells ship at storage voltage — typically 3.6–3.7V per cell, giving roughly 7.2–7.4V across the pack. When PTT is pressed, transmit current spikes sharply. If the BMS sees that spike against a cell still at low storage voltage, it can trigger an overcurrent cutoff and drop the transmission. This is not a defective battery. One or two full charge cycles bring the cells to rated capacity and raise the resting voltage enough that the BMS threshold is no longer tripped on PTT inrush.

Bar indicator showing one fewer bar than expected on a new BP-279 replacement

The F1000 uses a simple voltage-threshold bar indicator — each bar corresponds to a voltage band, not a fuel gauge. A new pack at storage voltage sits at the lower edge of the top band, so the radio may display one bar fewer than a fully charged original. This is a voltage reading, not a capacity fault. Charge the pack fully in the dock — when resting voltage reaches approximately 8.3–8.4V — and the indicator will reflect the correct state.