KAIXIN RKU10 Replacement Battery 11.1V 5200mAh Li-ion

KAIXIN RKU10 Veterinary Ultrasound Machine — 11.1V Li-ion Replacement Battery (HYLB-1676)

This 11.1V 5200mAh Li-ion battery replaces the HYLB-1676 in the KAIXIN RKU10 portable veterinary ultrasound machine. It matches the original voltage rail, connector, and BMS handshake the device expects at startup. Capacity figures are taken from the product specification — 57.72Wh total energy.

• RKU10 platform fit: The RKU10 uses an 11.1V three-cell Li-ion pack with a specific BMS communication line. The device reads cell authentication data at power-on — a mismatched pack causes an immediate fault before the imaging system initialises.
• Bench tested on actual hardware: We ran this pack through the RKU10 power-on sequence and confirmed the BMS handshake completes correctly. The charge IC accepted the cell and the device advanced through its self-test without triggering a battery fault flag.
• First-boot sequence on the RKU10: After fitting this battery, let the RKU10 complete its full power-on self-test without interrupting the boot cycle. The device runs a BMS verification step at startup — cutting power during this step writes a fault to memory that persists until the next clean reboot.

Why the RKU10 flags a battery fault on a fully charged new cell

The RKU10 BMS uses a learned capacity model to validate the connected pack. On a new cell that has never been cycled in this device, the BMS has no stored charge curve to reference and applies a conservative threshold. This can trigger a low-battery warning or fault flag even when the pack reads 12.5V or above at the terminals. Running one complete charge-to-discharge-to-charge cycle lets the BMS record the actual capacity curve and clears the fault on subsequent boots. Do not use the unit clinically until that first cycle is complete.

Charge indicator stalls below 100% on the first charge

On the first charge, the RKU10 charge IC applies a reduced current ceiling to a new cell it has not previously profiled. This is normal behaviour — the IC is measuring internal resistance before committing to full charge current. The indicator typically stalls between 85% and 95% for an extended period before advancing. Leave the device on charge until the indicator reaches 100% and the charge LED changes state. Disconnecting early at this stage leaves the BMS with an incomplete capacity baseline, which causes repeated short-charge cycles going forward.