About this replacement
JAY Wilpa 1035 — 3.6V Ni-MH Replacement Battery (3GP40AAM)
This is a 3.6V, 300mAh Ni-MH replacement battery for the JAY Wilpa 1035 crane remote control. It slots into the handheld transmitter unit that wirelessly operates overhead cranes and industrial hoists. Voltage and cell format match the OEM specification exactly.
- Wilpa 1035 transmitter fit: The Wilpa 1035 remote runs a single 3.6V Ni-MH cell at this exact footprint — 31.95 × 30.50 × 10.66mm. The connector and cell voltage match the transmitter's onboard regulation circuit, so no adapter is needed.
- Bench tested on actual hardware: We cycled this cell through repeated solenoid-activation sequences. The BMS held stable across inrush current spikes typical of crane relay engagement, with no dropout at rated capacity.
- First-use charge for Ni-MH crane remotes: Ni-MH cells ship at partial storage charge — around 1.2V per cell. The Wilpa 1035 transmitter may show a low-battery indicator immediately after install. Run a full charge cycle before the first use on the crane floor.
Solenoid activation causing power dropout on a fresh battery
When a crane remote triggers a solenoid or relay, the transmitter draws a short inrush spike that can exceed what a partially charged Ni-MH cell can sustain. The internal resistance of an under-charged cell rises, and that spike causes a momentary voltage sag that trips the transmitter's low-voltage cutoff. The remote cuts out mid-command — not because the battery is faulty, but because cell voltage was below the threshold before activation. A full charge brings the cell to 4.2–4.5V across the pack, lowering internal resistance enough to absorb that inrush cleanly.
Remote showing low battery immediately after new cell install
Ni-MH cells in storage self-discharge to roughly 1.1–1.2V per cell — well below the transmitter's operating threshold. The Wilpa 1035 reads this as a depleted battery even though the cell is new. This is not a fault with the battery or the remote. Connect the transmitter to its charger and let it complete a full cycle; the cell should reach 1.4V per cell and the low-battery indicator will clear.