About this replacement
Inrico IRC380 — 7.7V Li-ion Replacement Battery (B-83F)
This is a 7.7V 3000mAh lithium-ion battery for the Inrico IRC380 portable digital two-way radio. It replaces OEM part number B-83F. Voltage and cell count match the IRC380's power rail exactly, so the BMS handshake completes normally on first insertion.
- IRC380 platform fit: The IRC380 runs a 7.7V two-cell Li-ion configuration with a specific BMS handshake protocol. This pack matches that voltage rail and connector pinout, so the radio's protection circuit recognises the pack without triggering a fault state on power-up.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the IRC380 platform. The BMS held its over-current threshold correctly during simulated PTT transmit spikes, and the pack accepted charge without fault from the IRC380 dock charger.
- First-insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The IRC380 dock requires a clean contact cycle to complete the BMS handshake before it begins charging.
Why the IRC380 cuts out mid-transmission on a new B-83F pack
New Li-ion cells ship at storage voltage — typically around 3.7V to 3.8V per cell, not full charge. The IRC380's BMS monitors voltage under load, and a PTT transmit draw can pull a storage-voltage pack below the BMS cutoff threshold momentarily, causing the radio to drop out. This is not a faulty pack. Charge the battery fully before first use and the transmit current draw will stay well within the BMS window. A fully charged B-83F cell rests at approximately 4.2V per cell, giving the pack enough headroom to handle the IRC380's peak RF output current.
IRC380 bar indicator showing one fewer bar than expected after fitting a new B-83F
The IRC380 uses voltage-threshold bar indicators — each bar corresponds to a voltage band, not a percentage from a fuel gauge chip. A new pack at storage voltage sits in a lower threshold band, so the radio displays fewer bars than the pack actually has capacity to deliver. This is normal behaviour. Charge the pack fully in the dock and the indicator will step up to the correct bar level once cell voltage reaches the top threshold, typically at or above 8.2V across the two-cell pack.