Cobra GA-BP3 PR145 Compatible Battery 3.6V 700mAh

Cobra PR145 / PR150 / PR155 GMRS — 3.6V Ni-MH Replacement Battery (GA-BP3)

This is the GA-BP3 Ni-MH pack for Cobra PR145, PR150, and PR155 GMRS handheld radios. It runs at 3.6V with a 700mAh capacity. The physical dimensions are 44.50 × 31.00 × 11.00mm — same footprint as the original Cobra battery.

• PR145, PR150, and PR155 GMRS compatibility: These three models share the same 3.6V Ni-MH chemistry, connector pinout, and battery bay dimensions. One GA-BP3 pack covers all three without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and PTT-burst discharge sequences on a PR150. The BMS handled transmit current spikes without tripping, and the voltage held steady across repeated short-burst transmissions.
• First insertion on the Cobra dock: If the charger shows a fault indicator on first insert, remove the pack and wipe the contact pads with a dry cloth before reseating. The Cobra dock runs a contact check before accepting the new pack — a residue-covered pad can block that handshake and prevent charging from starting.

Why the PR145 cuts out mid-transmission on a new GA-BP3

A new Ni-MH cell ships at storage voltage — typically around 1.1V per cell, not the 1.2V nominal it reaches after conditioning. On a 3-cell pack like this one, that means the pack may sit just above 3.3V when you first insert it. When PTT is pressed, transmit draw spikes sharply, and that marginal voltage dips further, triggering the radio's low-voltage cutout. The fix is to run one full charge cycle before using the radio. After the first full charge, the pack stabilises at its rated 3.6V and handles transmit bursts without dropout.

Bar indicator reading one bar low after fitting a new GA-BP3

The PR145 series uses a simple voltage-threshold bar display — each bar maps to a voltage band, not a calculated capacity. A new pack at storage voltage reads lower than a fully charged one, so the indicator may show one fewer bar than expected even though the pack is not faulty. Charge the pack fully before reading the indicator. Once the pack reaches full charge voltage, the bar display will step up to reflect the actual state.