BL-13UV Baofeng UV-13 Pro Compatible Battery 7.4V 2000mAh

Baofeng UV-13 Pro / UV-88 / RT-85 — 7.4V Li-ion Replacement Battery (BL-13UV)

The BL-13UV is a 7.4V, 2000mAh Li-ion pack for the Baofeng UV-13 Pro and compatible handhelds including the MU-5 MURS, UV-88, and RT-85. It uses the same connector footprint and BMS voltage thresholds as the original pack. Swap it into the same battery bay — no modifications needed.

• UV-13 Pro platform compatibility: The UV-13 Pro, UV-88, and RT-85 all share the BL-13UV form factor because they run the same 7.4V nominal voltage rail and use an identical gold-contact strip for BMS communication with the charger dock. A battery that passes handshake on one of these radios will pass on the others.
• Bench tested on actual hardware: We cycled this pack through repeated PTT transmit bursts to confirm the BMS handles the current spike without tripping into overcurrent lockout. Voltage held stable across the transmit window, and the protection circuit reset cleanly between cycles.
• First-insertion contact check: If the charger dock shows a fault LED on first seating, pull the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to accept the new BMS handshake before it begins charging — this is specific to the UV-13 Pro's dock logic, not a cell defect.

Why the UV-13 Pro drops to reduced TX power mid-shift on a fresh BL-13UV

New Li-ion cells ship at storage voltage — typically around 3.6–3.7V per cell, not the 4.2V full-charge ceiling. Under sustained RF output, the radio's power amplifier draws peak current and the BMS reads the resulting voltage sag as a low-battery condition. The radio responds by stepping down transmit power to protect the pack. A full charge cycle before the first shift eliminates this behaviour entirely.

Bar indicator stuck on two bars even after a full charge

The UV-13 Pro uses a simple voltage-threshold bar display — it reads pack voltage directly and maps it to bar segments, with no fuel gauge chip behind it. A new cell that hasn't completed its first full cycle can rest at a voltage that the radio maps to two bars rather than four. Run the pack through one full charge to 8.4V, then discharge under normal use, and repeat once. After that conditioning cycle, the bar display will reflect actual charge state accurately.