About this replacement
Motorola Radius P110 — 7.5V Ni-MH Replacement Battery (HNN8148)
This is a 7.5V, 1800mAh nickel-metal hydride battery for the Motorola Radius P110 two-way radio. It replaces OEM part numbers HNN8148, HNN8148A, and HNN8148B. The cell format, connector, and BMS profile match the original P110 battery specification.
- Radius P110 platform fit: The P110 shares a single battery format across its production run. Voltage rail stays at 7.5V and the connector pinout is consistent across HNN8148 variants A and B, so all three OEM part numbers draw from the same physical pack specification.
- Bench tested on actual hardware: We cycled this pack through transmit loads on the P110 platform. The BMS handled the PTT current spike without tripping, and the cell voltage held steady through repeated key-up events at full RF output.
- First insertion into the P110 charger dock: If the dock LED blinks fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The P110 charger requires a clean contact cycle to complete the BMS handshake before it accepts the pack for charging.
Why the Radius P110 cuts out mid-transmission on a new Ni-MH pack
Ni-MH cells ship at partial storage voltage — typically around 6.8V to 7.0V on a fresh pack. The P110's BMS treats a sharp voltage dip during the transmit current surge as a brownout condition and cuts the RF stage. This is not a faulty battery. Run one or two full charge cycles before heavy use and the cells will hold voltage more firmly under transmit load. After conditioning, PTT cutouts during normal use should stop.
Bar indicator showing one fewer bar than expected after fitting a new HNN8148
The P110 reads voltage thresholds to drive its bar indicator — it has no fuel gauge chip. A new Ni-MH pack at storage voltage sits below the threshold for a full bar display, so the radio shows one bar short even with a healthy cell inside. Charge the pack fully before reading the indicator. After a complete charge cycle, resting voltage should sit at or above 7.5V and the bar display will reflect actual cell state.