About this replacement
Burdick Eclipse Plus — 16.8V Ni-CD Replacement Battery (146-0100-00)
This is a 16.8V, 5500mAh Ni-CD replacement battery for the Burdick Eclipse Plus electrocardiograph. It fits the portable ECG unit used in clinical settings for cardiac monitoring and diagnostics. OEM part numbers covered include 146-0100-00, 5003, 92301, AS35003, B11270, and OM11270.
- Eclipse Plus platform fit: The Eclipse Plus runs a 16.8V nominal rail with a Ni-CD chemistry requirement baked into its charge IC. Substituting Li-ion here causes charge termination faults — the BMS expects the flat discharge curve Ni-CD delivers, not the voltage slope of lithium cells.
- Bench tested on actual hardware: We cycled this cell through the Eclipse Plus charge circuit and confirmed the BMS accepted the pack, completed charge termination correctly, and passed the device's power-on self-test without flagging a battery fault.
- Post-swap startup sequence: After installing this battery, let the Eclipse Plus complete its full power-on self-test without interrupting it. The device runs a BMS verification cycle at boot — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot.
Eclipse Plus not completing boot sequence on new battery
The Eclipse Plus boot sequence includes a battery verification step that checks cell voltage against a stored threshold. A new Ni-CD cell sitting at its shipping state of charge may read below this threshold, causing the device to halt before completing startup. This is not a fault with the battery — it is the charge IC applying a conservative floor. Charge the pack fully to 16.8V before the first boot, then power on and allow the self-test to run without interruption.
Low battery alarm triggers immediately after a confirmed full charge
The Eclipse Plus alarm threshold is calibrated to OEM cell chemistry and expects a specific voltage-versus-capacity curve. A new replacement cell has not yet settled into that curve — Ni-CD cells need one full charge-discharge cycle before their voltage profile stabilises. On the first cycle, the device may read the cell as low even when it is not. Run one complete charge-discharge cycle before clinical use, and the alarm threshold will track correctly from the second cycle onward.