About this replacement
CardiAid CT0207RF Series — 12.0V Alkaline Replacement Battery (110878-O)
This is a 12.0V 11500mAh alkaline replacement battery for the CardiAid CT0207RF, CT0207RS, and CT0207 automated external defibrillators. It matches the OEM voltage and capacity spec and uses part numbers 110878-O and CA-4BP for cross-reference. Install this when the device flags a low battery warning or fails its scheduled self-test.
- CT0207RF, CT0207RS, CT0207 compatibility: All three models share the same battery bay format, 12.0V power rail, and BMS handshake protocol. The same cell fits each variant without modification to contacts or firmware.
- Bench tested on actual hardware: We ran this cell through the CT0207 power-on sequence and confirmed the BMS accepted the new battery, completed its internal verification pass, and cleared all low battery flags. No false fault codes were triggered.
- Post-installation self-test protocol: After fitting this battery, allow the device to run its full power-on self-test without interruption. CardiAid AEDs run a BMS verification cycle at startup — cutting power during this sequence causes a false battery fault that persists until the next complete reboot.
Self-test failure after battery swap on the CT0207 series
The CT0207 BMS uses a learn cycle to calibrate against the installed cell's chemistry profile. A fresh alkaline cell has not yet completed this cycle, so the first self-test can return a marginal or fail result even when the battery is fully charged. This is not a defective battery — it is the BMS establishing a baseline. Run one complete charge-to-discharge cycle and allow the device to perform a scheduled self-test before returning the unit to clinical deployment.
Low battery alarm persists after confirmed new battery installation
If the device continues to alarm low battery immediately after fitting a new cell, the BMS has not yet cleared the previous fault state. Power the device off completely, wait 30 seconds, then power on and allow the self-test sequence to run to completion without interruption. The alarm clears once the BMS registers a voltage reading above its recovery threshold — typically 11.4V at rest for this chemistry. If the alarm persists past two full reboots, check the battery contacts for corrosion from the previous cell.