About this replacement
SaverOne D / P / Automatic / Semi Automatic — 27V Li-MnO2 Replacement Battery (SAV-C0010)
This is a 27V, 1400mAh lithium manganese dioxide replacement battery for the SaverOne Model D, P, Automatic, and Semi Automatic personal safety devices. It replaces OEM part numbers SAV-C0010 and SAV-C0904. Voltage and cell chemistry match the original specification exactly — the BMS in these units rejects cells outside its narrow acceptance window.
- SaverOne D, P, Automatic, and Semi Automatic compatibility: These four models share a common power architecture — same 27V rail, same BMS handshake protocol, and the same Li-MnO2 cell chemistry requirement. Substituting a different chemistry, even at the same voltage, will trigger a BMS rejection fault.
- Bench tested on actual hardware: We ran this cell through a full charge cycle on SaverOne hardware and monitored the BMS handshake. The protection circuit accepted the cell, completed charge termination correctly, and passed the device self-test without fault flags.
- Post-installation self-test protocol: After fitting this battery, allow the SaverOne unit to complete its full power-on self-test cycle without interruption. These devices run a BMS verification sequence at startup — cutting power mid-sequence locks in a false battery fault that persists until the next clean reboot.
Device not completing boot sequence after battery swap
SaverOne units run a multi-stage initialisation sequence that includes a BMS handshake and a self-test of the emergency communication module. If the battery voltage sits below roughly 24V at the moment of installation — common after extended shelf storage — the boot sequence stalls before completing. The device may display a partial screen or cycle back to the start screen repeatedly. Charge the battery to full before fitting it, and confirm the terminal voltage reads at or above 27V before insertion.
Low battery alarm triggers immediately after a confirmed full charge
This happens because the SaverOne BMS calibrates its low-battery threshold against the charge curve it has seen before. A new cell has a slightly different discharge profile than a worn OEM cell, and the BMS reads that as a low-charge condition on the first cycle. It is not a fault with the battery. Run one complete charge-discharge cycle — let the device discharge to auto-shutoff, then charge fully — and the BMS recalibrates its threshold to the new cell's curve. The alarm clears after that first conditioning cycle.