About this replacement
Baofeng UV-82 Series — 7.4V Li-ion Replacement Battery (BL-8)
This is a 7.4V 1800mAh Li-ion replacement for the Baofeng BL-8 battery pack. It fits the UV-82, UV-8R, UV-82X, UV-82C, and several additional UV-82 variants. Voltage and capacity match the original spec exactly.
- UV-82 series compatibility: The UV-82 family shares a common battery bay, contact layout, and BMS handshake across all variants. The BL-8 form factor covers the full lineup because Baofeng kept the same power rail across UV-82, UV-8R, UV-82X, and UV-82C — one pack works across all of them without modification.
- Bench tested on actual hardware: We cycled this pack on a UV-82 under simulated PTT load. The BMS handled the transmit current spike without tripping, and voltage held steady through both VHF and UHF output. No thermal cutoff events occurred across the test cycle.
- First insertion on the Baofeng drop-in charger: If the charger LED blinks or shows a fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The BL-8 ships at storage voltage — the charger needs a clean contact cycle to accept the BMS handshake before it begins charging.
Why the UV-82 cuts out mid-transmission on a new BL-8
The UV-82 draws a sharp current spike the moment PTT is pressed — RF output on this radio can pull close to 2A briefly on high-power mode. If the BMS reads that spike as an overcurrent event, it trips and cuts power to the radio instantly. This is more common when the pack has just come off a partial charge or has been sitting unused for weeks. A full charge cycle resets the BMS state and raises cell voltage above the overcurrent trip threshold, which prevents false trips under TX load.
Bar indicator showing one fewer bar than expected after a full charge
The UV-82 uses a simple voltage-threshold bar display — each bar represents a voltage band, not a percentage. A new BL-8 arriving at storage voltage (typically around 3.7–3.8V per cell) can show one or two bars even when the pack is not depleted. This is not a fault. Charge the pack fully to 8.4V and the bar indicator will read correctly on the next power cycle.