About this replacement
Akerstroms BC85 / BC95 Series — 7.4V Li-ion Replacement Battery (932482-000)
This 7.4V 2600mAh lithium-ion battery replaces part number 932482-000 in Akerstroms crane remote control units. It fits the BC85, BC95, M-200J, RMC31, and compatible models in the same series. Each cell pack ships at storage voltage — charge before first use.
- BC85 / BC95 / M-200J / RMC31 compatibility: These remotes share the same 7.4V two-cell Li-ion rail, connector pinout, and BMS handshake protocol. One battery pack covers the range without any modification to the remote housing or charging cradle.
- Bench tested on actual hardware: We cycled this pack through repeated solenoid-activation sequences on a BC85 unit. The BMS held voltage through inrush events without triggering dropout. Cell balance stayed within 30mV across five discharge cycles.
- Monthly charge requirement for idle remotes: Crane remotes stored between lifts can sit uncharged for months. Li-ion cells that drop below 2.5V per cell trigger a deep-discharge BMS lockout. Connect this pack to the cradle charger once a month during any idle period to keep cells above that threshold.
Solenoid activation causing power dropout on a new battery
When a crane remote fires a solenoid or relay, the inrush current spike can briefly exceed the BMS overcurrent threshold. An aged or undercharged cell pack has higher internal resistance, which amplifies the voltage sag at that moment. This trips the BMS protection circuit and the remote drops power mid-command. A fully charged pack at 8.4V reduces internal resistance enough to absorb the inrush without triggering the cutoff.
Remote shows low battery immediately after installing a new cell
Li-ion packs ship at approximately 3.7V per cell — roughly 50% state of charge — to meet safe transport requirements. The BC85 firmware reads resting voltage to estimate charge state, so a storage-voltage pack will display a low-battery warning on power-up. This is not a fault with the battery. Place the pack in the cradle charger and charge to 8.4V before operating the remote.