Gross Funk Ego Crane Remote Compatible Battery 7.2V 700mAh

Gross Funk Ego / FUA-50 — 7.2V Ni-MH Replacement Battery (100-001-885)

This is a 7.2V 700mAh Ni-MH replacement battery for the Gross Funk Ego and FUA-50 series crane remote controls. It fits the wireless handheld transmitter used to operate overhead and gantry cranes on industrial jobsites. Capacity is 700mAh (5.04Wh), matching the original specification.

• Ego and FUA-50 transmitter compatibility: Both the Ego and FUA-50 handsets share the same 7.2V cell pack configuration, connector pinout, and charge circuit — which is why they take the same replacement unit. Cross-referencing OEM part numbers 100-001-885, FUA-50, RGRO7270, and GRO885 all point to this pack.
• Bench tested on actual hardware: We ran this battery through the Ego transmitter's charge cycle and verified the BMS accepted the pack without fault codes. Solenoid activation commands were issued during discharge and the pack held voltage without dropout at this capacity rating.
• Monthly charge during crane downtime: Crane remotes often sit unused for weeks between jobs. Ni-MH cells self-discharge faster than Li-ion — typically 20–30% per month. Charge this pack once a month during any extended idle period to prevent the cell voltage from dropping to a level where the charger no longer recognises it.

Why the Ego remote goes dark after months of storage

Ni-MH cells self-discharge continuously, even with no load. A Gross Funk Ego transmitter left on a shelf for two or three months can have a pack voltage low enough that the internal protection circuit won't allow normal startup. The remote powers on briefly then shuts off, or shows nothing at all. This is not a faulty battery — it is a depleted one. Connect the transmitter to its charger and leave it for at least 30 minutes before attempting to power on.

Remote showing low-battery warning immediately after installing a new pack

Replacement Ni-MH packs ship at storage voltage — typically around 1.0–1.1V per cell, which is below the operating threshold for the Ego transmitter's voltage monitor. The remote reads this as a depleted pack and flags it immediately. This is not a defective battery. Place the transmitter on charge before first use and allow a full charge cycle to complete — the low-battery indication clears once the pack reaches approximately 7.2V under no-load conditions.