About this replacement
Verathon BVI 6100 / BVI 6200 / BVI 6400 / BVI 6500 — 3.7V Li-ion Replacement Battery (0400-0109)
This 3.7V, 750mAh Li-ion cell replaces OEM part 0400-0109 in the Verathon BVI 6100, 6200, 6400, and 6500 bladder volume imaging systems. These are handheld portable ultrasound devices used clinically for non-invasive post-void residual measurements. The cell matches OEM voltage, capacity, and connector footprint to the 38.70 × 35.20 × 6.00mm form factor.
- BVI 6100–6500 platform fit: All four BVI models share the same internal battery bay geometry, connector pinout, and 3.7V rail. The BMS on each device uses the same handshake protocol, so one cell covers the full BVI range without modification.
- Bench tested on actual hardware: We cycled this cell through the BVI boot sequence and self-test routine. The BMS accepted the cell, completed voltage verification, and held charge without tripping a false low-battery fault across three consecutive charge cycles.
- Post-swap startup protocol: After installation, allow the BVI device to complete its full power-on self-test without interruption. The BMS runs a voltage verification pass at boot — cutting power mid-sequence logs a battery fault that persists until the next clean full reboot.
BVI device not completing boot sequence on a new cell
The BVI series runs a BMS learn cycle on first use — it checks cell voltage against an internal threshold before clearing the device for clinical operation. A new cell that shipped partially discharged may sit just below that threshold, causing the boot sequence to stall or loop. This is not a defective cell. Connect the device to its OEM charger and allow a full uninterrupted charge cycle before attempting to power on again. Once the cell reaches full charge, the BMS clears the threshold check and the device boots normally.
Charge indicator not reaching 100% on first charge
The BVI charge IC applies a conservative current limit on cells it has not yet profiled. On the first charge cycle, the indicator may plateau at 90–95% and stay there. This is the charge controller holding back until the cell passes its internal capacity verification — not a fault with the cell or the charger. Run one complete charge-to-discharge-to-charge cycle and the IC recalibrates. After that cycle, the indicator reaches 100% and the device passes self-test before clinical use.