About this replacement
Ravioli LNH800 — 3.6V Ni-MH Replacement Battery (NH800)
This is a 3.6V, 700mAh Ni-MH replacement battery for the Ravioli LNH800 crane remote control. It uses OEM part number NH800 and fits wireless industrial crane and hoist remotes that rely on this cell format. If the original battery has degraded or failed completely, this restores full remote function.
- LNH800 and cross-compatible remotes: The LNH800, Grundfos MTR15, and associated remote units share the same 3.6V single-cell Ni-MH voltage rail and connector footprint. The BMS handshake on these remotes expects a cell within a narrow voltage window — swapping in a mismatched chemistry will trigger a no-power condition immediately.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on crane remote hardware. The BMS accepted the cell cleanly, the low-battery indicator cleared after a full charge, and solenoid activation held stable without voltage dropout under repeated relay cycling.
- Monthly charge during idle storage: Crane remotes used seasonally or left on the shelf between jobs are at real risk of cell voltage dropping below the recovery threshold. Charge this battery once a month during any idle period — Ni-MH cells left fully discharged for weeks can sustain permanent capacity loss that no charger can reverse.
Solenoid activation causing power dropout on a freshly installed battery
When a solenoid or relay fires inside the crane's receiver, it draws a short inrush current spike that can exceed what a low-state battery can deliver. The BMS interprets this surge as an over-current event and momentarily cuts output — the remote goes dark or resets mid-operation. A fully charged cell handles this inrush without tripping. If dropouts happen only at the moment of activation, charge the battery to full before further use and retest. A cell that still drops out at full charge has likely lost internal capacity and needs replacement.
Remote showing low battery immediately after a new cell is installed
A new Ni-MH cell ships at storage voltage — typically around 1.1V to 1.2V — which is below the operating threshold the remote's firmware checks on startup. The low-battery warning is accurate: the cell simply has not been charged yet. Connect the remote to its charger and run a full charge cycle before first use. Once the cell reaches its nominal 1.2V per cell under load, the indicator clears and the remote operates normally.