About this replacement
Akerstroms BC85 / BC95 Series — 7.4V Li-ion Replacement Battery (932482-000)
This 7.4V, 3400mAh lithium-ion battery replaces OEM part 932482-000 in Akerstroms crane remote control systems. It fits the BC85, BC95, M-200J, and RMC31 platforms, along with five additional compatible models. Voltage and cell chemistry match the original spec exactly.
- BC85 / BC95 / M-200J / RMC31 platform fit: These remotes share the same 7.4V dual-cell Li-ion architecture, connector pinout, and BMS handshake protocol — one battery pack covers the full lineup without modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the BC85 platform. The BMS communicated correctly, charge acceptance was normal, and the pack held voltage under simulated solenoid activation loads without triggering overcurrent cutoff.
- Monthly charge during crane idle periods: Crane remotes often sit unused for weeks at a time. Li-ion cells left discharged below 2.5V per cell can enter BMS lockout — the pack appears dead even when a charger is connected. If the remote is benched for extended periods, top up the battery once a month to keep cells above the recovery threshold.
Solenoid activation causing power dropout on a new battery
When a crane remote triggers a solenoid or relay, the inrush current spike can momentarily pull cell voltage down hard and fast. If the BMS detects that drop as an overcurrent event, it shuts the pack off to protect the cells. This is more likely with a partially charged battery — cell impedance rises as state of charge drops, amplifying the voltage sag under load. Running the pack at full charge before operating the crane keeps internal resistance low and gives the BMS more headroom before cutoff triggers.
Remote showing low battery immediately after installing a new pack
Replacement Li-ion packs ship at storage voltage — typically around 3.6V to 3.7V per cell, not the 4.2V per cell that represents a full charge. The BC85 remote reads state of charge from cell voltage, so a pack at storage voltage registers as partially depleted the moment it powers on. This is not a faulty battery. Connect the pack to the charger before first use and allow it to reach full charge — the low-battery indicator will clear once cells reach approximately 8.4V combined.