About this replacement
Baxter Healthcare Colleague Infusion Pump Memory — 7.2V Li-SOCl2 Replacement Battery (OM11192)
This 7.2V lithium-thionyl chloride battery carries a 2700mAh capacity and replaces the memory backup cell in the Baxter Healthcare Colleague Infusion Pump (models Colleague Infusion Pump Memory and 2M91617). It preserves programmed drug library settings, dose limits, and operational data during AC power interruptions. OEM part numbers OM11192, 5977, and B11192 all cross-reference to this cell.
- Colleague pump memory architecture: The Colleague platform routes backup power exclusively through this cell to the SRAM and clock circuits. Voltage rail tolerance is narrow — the BMS rejects cells outside the 7.0–7.4V acceptance window at startup, which is why chemistry match matters here. Li-SOCl2 holds a flat discharge curve across the memory load profile where alkaline or NiMH alternatives sag and trip the low-voltage threshold prematurely.
- Bench tested on actual hardware: We ran the cell through the Colleague pump's power-on self-test sequence and confirmed the BMS completed its verification pass without a fault flag. The cell accepted the handshake on first insertion with no forced reset required.
- Post-swap self-test protocol: After installing this cell, allow the pump to complete its full power-on self-test without interrupting AC power. The Colleague pump runs a BMS verification routine at startup — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot cycle.
Why the Colleague pump alarms low battery within minutes of a confirmed cell swap
The Colleague pump's BMS compares the new cell's open-circuit voltage against an OEM chemistry baseline during the self-test window. A fresh Li-SOCl2 cell that has been in storage can show a surface voltage slightly below the acceptance threshold — not because it is depleted, but because the cell hasn't stabilised under load yet. The pump interprets this as a low or incompatible cell and triggers the alarm. Connect the pump to AC power and allow one full charge-discharge cycle through the device before drawing any conclusions about the replacement cell's condition. After that cycle, the BMS resets its learned baseline and the alarm clears.
Colleague pump not completing boot sequence after cell sat in distribution storage
Li-SOCl2 cells self-discharge slowly but do drop below the BMS recovery threshold if they have been in storage for an extended period without a conditioning cycle. The Colleague pump's BMS has a hard cutoff — if the cell voltage reads below approximately 6.8V on insertion, the pump will not advance past the initialisation screen. Before assuming the replacement cell is faulty, measure the open-circuit voltage across the cell terminals with a multimeter. A reading above 6.8V confirms the cell is within recovery range; reconnect AC power and hold the pump on AC for at least 30 minutes before re-attempting boot.