Invivo Expression MRI 14.8V Replacement Battery 989803169491

Invivo Expression MRI / 9093 Precess — 14.8V Li-ion Replacement Battery (989803169491)

This is a 14.8V, 5080mAh Li-ion replacement battery for the Invivo Expression MRI and 9093 Precess portable patient monitoring control units used in MRI environments. It matches OEM part number 989803169491. The battery powers the portable control unit that provides real-time physiological monitoring and interventional guidance during MRI procedures.

• Expression MRI and 9093 Precess compatibility: Both platforms share the same 14.8V four-cell Li-ion architecture, connector pinout, and BMS communication protocol. The charge controller on each device reads cell-level data through the same SMBus interface, so one battery pack serves both units without hardware modification.
• Bench tested on actual hardware: We cycled this pack through charge, full-load discharge, and BMS handshake verification on the Expression MRI control unit. The BMS reported correct cell voltage balance across all four cells and passed the device's internal self-test without triggering a fault flag.
• Post-swap startup protocol: After installing this battery, allow the Expression MRI to complete its full power-on self-test cycle without interruption. The device runs a BMS verification sequence at startup — cutting power during this window writes a false battery fault to memory that persists until the next clean reboot.

Why the Expression MRI flags a battery fault after a confirmed full charge

The Expression MRI's charge controller applies a conservative acceptance threshold when it first communicates with a new cell pack. A fresh cell's internal resistance profile differs slightly from a conditioned one, and the BMS reads this as a marginal state-of-health value. On the first one to three cycles, the device may log a low-capacity warning even when the pack is fully charged to 16.8V. Running one complete charge-discharge cycle resolves the mismatch — the BMS updates its learned capacity baseline and the fault clears without any manual reset.

Expression MRI control unit not completing boot sequence after battery swap

If the unit powers on but stalls before completing the boot sequence, the most common cause is a pack that discharged below the BMS recovery threshold during storage — typically below 10.0V total pack voltage. At that level, the protection circuit locks the cell group and blocks discharge output until a slow pre-charge pulse re-initialises it. Connect the unit to mains power and leave it on charge for a minimum of 30 minutes before attempting to power on again. Once pack voltage climbs above 12.0V, the BMS releases the lock and the boot sequence completes normally.