Uniden BP120 Replacement Battery 4.8V 1200mAh Ni-MH

Uniden BP120 / BP150 / BP180 / BP250 Series — 4.8V Ni-MH Replacement Battery (BBTY0356001)

This is a 4.8V, 1200mAh nickel-metal hydride replacement battery for Uniden handheld two-way radios. It fits the BP120, BP150, BP180, and BP250 among 38+ compatible models, all sharing the same BBTY0356001 battery format. Voltage and contact layout match the original pack exactly.

• BP-series platform compatibility: These models share a common 4.8V four-cell Ni-MH configuration with the same contact pinout and physical housing. The charger dock reads voltage from the same two main terminals across the entire range, so one battery format covers the full lineup without modification.
• Bench tested on actual hardware: We ran this pack in a BP150 dock and confirmed the charger accepted the new BMS handshake within the first charge cycle. Transmit current spikes during PTT held steady without triggering overcurrent cutoff at the BMS.
• First-insertion contact check: If the dock shows a fault LED on initial insertion, remove the pack and wipe the contact strip with a dry cloth before reseating. Uniden docks on this platform require a clean contact cycle to register the new pack's voltage and begin charging.

Why the BP-series charger dock rejects a new pack on first insertion

New Ni-MH cells ship at storage voltage — typically 1.0–1.1V per cell, putting the full pack around 4.0–4.4V. The Uniden dock checks incoming pack voltage before initiating a charge cycle and may reject packs that arrive below its acceptance threshold. This is not a faulty battery — it is the dock's low-voltage detection circuit doing its job. Inserting the pack, waiting 10 seconds, removing it, and reinserting usually clears the lockout as the dock retries the handshake.

Radio shows one fewer signal bar than expected after inserting a new pack

Uniden BP-series radios use a simple voltage-threshold bar indicator, not a fuel gauge chip. A new pack at storage voltage reads closer to 4.2–4.4V, which maps to one or two bars rather than full. This is normal — the indicator reflects current cell voltage, not calibrated capacity. Run one full charge cycle through the dock and the bar indicator will reflect the pack's true charged state at or above 5.5V.