About this replacement
Gross Funk GF500 Crane Remote Control — 7.2V Ni-MH Replacement Battery (BC-GF500)
This is a 7.2V, 2500mAh Ni-MH replacement battery for the Gross Funk GF500 crane remote control transmitter. It fits the handheld unit used to operate overhead cranes and lifting equipment in industrial environments. OEM part numbers BC-GF500, FUA15, FUA50, and 100-001-885 all cross-reference this cell pack.
- GF500 transmitter fit: The GF500 remote uses a 7.2V Ni-MH pack with a specific connector and physical footprint. This replacement matches the OEM cell configuration and BMS handshake so the transmitter's charge indicator and low-battery warning behave as expected after swap.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a GF500-compatible test rig. The BMS held cutoff voltage within spec and did not trigger false low-battery alerts at full charge. Solenoid activation draw did not cause voltage dropout during testing.
- Monthly charge during idle periods: Crane remotes often sit unused between jobs. Ni-MH cells self-discharge faster than Li-ion — typically 1–3% per day. A battery left in storage for two to three months can drop low enough that the transmitter refuses to power on. Charge this pack once a month during any idle period to prevent that.
Why the GF500 transmitter cuts out during solenoid or relay activation
When the crane's solenoid or relay engages, the receiver pulls a short but sharp inrush current spike. If the transmitter battery is partially discharged, its internal resistance rises — and that spike can drag cell voltage below the BMS cutoff threshold for a fraction of a second. The BMS interprets this as a fault and shuts down the output, causing the remote to drop signal mid-operation. A fully charged pack keeps internal resistance low enough to absorb that inrush without triggering cutoff. Always start a shift with a fully charged battery when solenoid-heavy operations are planned.
GF500 remote shows "low battery" immediately after fitting a new cell
New Ni-MH packs ship at storage voltage — typically around 6.0–6.5V for a 7.2V pack — not at full charge. The GF500 transmitter reads this as a low or depleted battery and flags the warning instantly. This is not a faulty cell. Place the battery on charge before first use and allow it to reach full charge voltage (around 8.5–8.7V at charge termination for a 7.2V Ni-MH pack). The low-battery indicator will clear once the pack is properly charged and seated.