About this replacement
Motoman HW9470932-A — 3.6V Li-SOCl2 Replacement Battery
This 3.6V Li-SOCl2 cell replaces the backup battery in the Motoman HW9470932-A industrial robotic controller. Capacity is 8100mAh (29.16Wh). It maintains SRAM program memory and the real-time clock when main power is interrupted.
- HW9470932-A controller fit: The Motoman HW9470932-A uses a dedicated Li-SOCl2 cell for SRAM retention — not a standard alkaline or NiMH pack. The 3.6V nominal voltage matches the controller's memory backup rail directly. Substituting a 3.0V cell will cause the BMS to flag a low-battery condition immediately.
- Bench tested on actual hardware: We verified the cell's open-circuit voltage at 3.65V before shipment and confirmed no passivation voltage drop beyond the normal Li-SOCl2 storage characteristic. The cell held load without BMS intervention during simulated SRAM retention draw.
- Hot-swap procedure for HW9470932-A: Always replace this cell with the controller powered on and in RUN mode. Removing the battery while the controller is off drains SRAM instantly — all ladder logic and parameter data is lost. A cold swap means a full program reload from your programming device before the robot can run again.
Why the HW9470932-A controller loses its program after a battery swap
The HW9470932-A holds its program in volatile SRAM, not flash. The Li-SOCl2 cell is the only power source keeping that memory alive when mains power is off. The moment the old cell is disconnected — even for seconds — SRAM loses power and all data is erased. To avoid this, keep the controller powered up throughout the swap so the SRAM rail stays live from the main supply while the battery is changed.
Battery alarm not clearing after the new cell is installed
The HW9470932-A does not auto-clear a battery alarm once the new cell is seated. The alarm is a latched fault in the controller's system software and requires a manual reset through the programming terminal or teach pendant. Additionally, a freshly installed Li-SOCl2 cell ships at storage voltage — typically 3.60–3.65V — and needs a few hours on the controller's float circuit before it reads at full rated voltage. Clear the alarm in software first, then confirm cell voltage has stabilised above 3.6V before signing off the maintenance record.