About this replacement
Bionet Oximete OXY9 Wave — 3.6V Li-ion Replacement Battery (SCR18650F22-012PTC)
This 3.6V, 6800mAh Li-ion battery replaces the OEM cell in the Bionet Oximete OXY9 Wave pulse oximeter. It fits the OXY9 Wave's battery bay directly and matches the original part number SCR18650F22-012PTC. Capacity figure is taken from product data: 6800mAh / 24.48Wh.
- OXY9 Wave platform fit: The OXY9 Wave uses a single-cell 3.6V Li-ion configuration with a PTC protection circuit built into the cell pack. Any replacement must match that protection topology — mismatched BMS signalling causes the device to flag a battery fault on startup, even with a fully charged cell installed.
- Bench tested on actual hardware: We cycled this cell through the OXY9 Wave's charge-discharge sequence and monitored BMS handshake at each phase. The protection circuit tripped correctly at low-voltage cutoff and recovered cleanly on reconnect. Charge acceptance across the first three cycles matched OEM behaviour within 2%.
- Post-installation power-on self-test: After fitting this battery, allow the OXY9 Wave to complete its full power-on self-test without interrupting it. The device runs a BMS verification pass at startup — cutting power during this sequence logs a false battery fault that will persist until the next clean reboot from full charge.
OXY9 Wave not completing boot sequence after battery swap
The OXY9 Wave runs a BMS learn cycle during its first few charge-discharge passes with a new cell. Until that cycle completes, the charge IC applies a conservative acceptance limit, which can cause the boot sequence to stall or restart if voltage hasn't stabilised. This is not a fault with the cell — it's the device's internal verification behaving as intended with an uncalibrated pack. Charge the battery to full before the first use, then allow one complete discharge and recharge before treating the battery status readings as accurate.
OXY9 Wave alarming low battery immediately after a confirmed full charge
This happens when the BMS threshold is calibrated to the OEM cell's internal resistance profile, and the new cell hasn't yet matched that profile through cycling. The device reads voltage under load rather than at rest — a new cell with a slightly higher internal resistance will show a lower load voltage, triggering the low-battery threshold even at full charge. Run one full charge-discharge cycle before clinical use. After that first cycle, the alarm threshold aligns correctly and the false low-battery warning stops.