About this replacement
Itowa Boggy / Combi Caja Spohn — 7.2V Ni-MH Replacement Battery (BT7216)
This is a 7.2V 2000mAh Ni-MH replacement battery for the Itowa Boggy and Combi Caja Spohn wireless crane remote controls. It fits industrial overhead and gantry crane remotes that take part numbers BT7216, BT7216MH, or 26.105. Voltage and capacity match the original specification exactly.
- Boggy and Combi Caja Spohn compatibility: Both remotes run the same 7.2V cell stack and share connector pinout, which is why they share a single OEM part number. The BMS on each unit reads cell voltage at startup — wrong voltage or chemistry will prevent the remote from initialising.
- Bench tested on actual hardware: We cycled this cell pack through full charge and load draws that simulate solenoid and relay activation. The BMS held cutoff thresholds correctly and did not trip under inrush current during activation events.
- Monthly charge interval for idle remotes: Ni-MH cells self-discharge at roughly 1–3% per day. If this remote sits unused for more than three weeks, put the battery on charge before the next lift. Cells left to drain fully can develop voltage reversal in one or more cells, which permanently reduces pack capacity.
Solenoid activation causing power dropout on a freshly installed battery
When the remote triggers a crane solenoid or relay, the inrush current spike can briefly pull the pack voltage below the BMS cutoff threshold. This causes the remote to cut out mid-command — not a fault with the remote itself, but a sign the battery was not at full charge when installed. A cell at storage voltage (around 6.0V for a 7.2V Ni-MH pack) has less headroom to absorb that spike. Charge the battery fully before first use and confirm resting voltage reads at or above 7.2V before operating the crane.
Remote showing low battery warning immediately after fitting a new cell
New Ni-MH cells ship at partial storage voltage — typically 5.8V to 6.2V for a 7.2V pack — not at full charge. The remote's voltage monitor reads this as a depleted battery and triggers the low-battery indicator straight away. This is not a fault with the replacement cell. Connect the battery to its charger for a full charge cycle before powering the remote on. Once the pack reaches its nominal 7.2V resting voltage, the warning clears.