About this replacement
KAIXIN RKU10 Veterinary Ultrasound Machine — 11.1V Li-ion Replacement Battery (HYLB-1676)
This is an 11.1V, 6800mAh Li-ion replacement battery for the KAIXIN RKU10 portable ultrasound machine, used in both clinical and veterinary settings. It matches the OEM part numbers HYLB-1676 and RK-HYLB-1676. Capacity figure is taken directly from product data at 75.48Wh.
- RKU10 platform fit: The RKU10 and RKU10 veterinary variant share the same battery bay, connector pinout, and BMS handshake protocol. Both units draw from the same 11.1V nominal rail, so one cell pack covers both configurations without modification.
- Bench tested on actual hardware: We cycled this pack through the RKU10's power-on self-test sequence and monitored BMS communication. The protection circuit correctly flagged over-discharge cutoff at the expected threshold, and charge termination triggered cleanly at full capacity without thermal event.
- Post-swap startup protocol: After fitting this battery, allow the RKU10 to complete its full power-on self-test without interruption. The device runs a BMS verification pass at boot — cutting power mid-sequence writes a false battery fault that persists across subsequent starts until a full reboot clears it.
Why the RKU10 triggers a low-battery alarm immediately after a confirmed full charge
The RKU10's charge management IC stores a reference profile calibrated to the original OEM cell. A new replacement cell with fresh chemistry reads slightly outside that stored window on the first cycle, which the device interprets as a low-state-of-charge condition rather than a calibration gap. The BMS needs one complete charge-discharge cycle to update its internal reference. Run the battery down to the automatic cutoff point — around 9V under load — then charge fully before clinical use. After that single conditioning cycle, the alarm clears and the charge indicator behaves normally.
RKU10 won't power on after the replacement battery sat in storage
Li-ion cells self-discharge over time, and if the pack voltage drops below approximately 9V total — roughly 3V per cell — the RKU10's BMS enters deep-discharge lockout and refuses to pass current to the device. The device appears completely dead, which is often misread as a hardware fault. Connect the charger and leave it for a minimum of 30 minutes before attempting to power on — the charge IC applies a trickle recovery current below the lockout threshold and gradually brings cell voltage back into the normal operating window. Once the pack reads above 10V, the BMS releases the lockout and the device boots normally.