BP34 Regency-Relm HH2500 Replacement Battery 10.8V 1200mAh

Regency-Relm HH2500 / HH400 Series — 10.8V Ni-MH Replacement Battery (BP34, MA181)

This is a 10.8V, 1200mAh Ni-MH replacement battery for the Regency-Relm HH2500, HH400, MINI-COMM1, and MINI-COMM2 handheld two-way radios. It replaces OEM packs BP34 and MA181 directly. Physical dimensions are 87.60 × 54.64 × 18.85mm — confirm these match your pack before ordering.

• HH2500 / HH400 platform fit: These models share the same 10.8V three-cell Ni-MH voltage rail, connector pinout, and BMS handshake protocol, which is why one pack covers the full lineup. Swapping between radios in this family does not require a different battery.
• Bench tested on actual hardware: We cycled this pack through transmit loads on the HH2500 platform and confirmed the BMS handled PTT current spikes without triggering an overcurrent lockout. Voltage held steady across repeated keying cycles.
• First insertion into the charger dock: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Regency-Relm charger requires a clean contact cycle to complete its BMS handshake before it will accept and begin charging a new pack.

HH2500 bar indicator showing fewer bars than expected after inserting a new pack

New Ni-MH cells ship at storage voltage — typically 1.20–1.22V per cell — not at full charge. The HH2500 reads voltage against fixed thresholds to light its bar segments, so a new pack at storage voltage will display one or two fewer bars than a fully charged one. This is not a fault with the pack or the radio. Run a full charge cycle first; the dock should move the pack up to approximately 13.2V (1.40V per cell at top of charge) before the indicator reflects actual capacity.

Radio cuts out mid-transmission on a fresh BP34 pack

Sustained RF output pulls significantly more current than standby draw, and a BMS set conservatively can trip on the transmit surge even when the cell voltage is adequate. On the HH2500, this typically shows as the radio dropping audio or keying out mid-PTT before returning to receive. Check that the contact strip is seated cleanly — a dirty or slightly misaligned contact adds resistance that amplifies the apparent current spike. If the fault clears after reseating and a full charge cycle, the BMS has reset; if it persists, verify pack voltage under load sits above 9.6V before suspecting a cell fault.