About this replacement
Drager TOFscan Monitor — 3.7V Li-ion Replacement Battery (MS32293)
This 3.7V 3400mAh Li-ion battery replaces the OEM cell in the Drager TOFscan and TOFScan NMT Monitor. Both devices use the same MS32293 cell to power the portable neuromuscular transmission monitoring unit during clinical procedures. Capacity is drawn from product data at 3400mAh (12.58Wh).
- TOFscan and TOFScan NMT Monitor compatibility: Both models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — the MS32293 cell fits and communicates correctly across both variants without modification.
- Bench tested on actual hardware: We cycled this cell through the TOFscan's charge and discharge profile, confirmed BMS recognition at startup, and verified the charge IC accepted a full charge to 4.2V without flagging a fault.
- Post-swap self-test protocol: After installing this cell, allow the TOFscan to complete its full power-on self-test without interruption. Medical device BMS verification runs at startup — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot.
Device not completing boot sequence after battery swap
The TOFscan runs a BMS learn sequence on first boot with a new cell. If the cell voltage sits below approximately 3.5V from storage, the device may halt mid-boot or display a battery error before the self-test completes. This is not a faulty cell — it is the BMS rejecting a partially discharged replacement. Connect the device to mains power, allow a full uninterrupted charge cycle, then reboot before attempting clinical use.
Charge indicator not reaching 100% on first charge
On the first charge cycle, the TOFscan's charge IC applies a conservative current limit to an uncharacterised cell, which can cause the charge indicator to plateau at 90–95% and stall. This is a calibration behaviour, not a capacity defect. Run one full charge-to-discharge-to-charge cycle and the charge IC recalibrates its end-of-charge threshold. After that cycle, the indicator should reach 100% consistently.