Integra 8 Channel VIAFLO 4205 Replacement Battery 3.7V 1200mAh

Integra 8 Channel VIAFLO / VOYAGER Series — 3.7V Li-ion Replacement Battery (4205)

This 3.7V, 1200mAh Li-ion cell replaces OEM part 4205 in the Integra VIAFLO and VOYAGER series of automated electronic pipettes. It fits the 12 Channel VIAFLO, 12 Channel VOYAGER, 16 Channel VIAFLO, 4 Channel VOYAGER, and 36 additional configurations in the same family. Voltage and capacity match the original cell exactly.

• VIAFLO and VOYAGER platform compatibility: These instruments share a common battery footprint, connector pinout, and BMS communication protocol across the 4, 8, 12, and 16 channel variants. One cell specification covers the full range because Integra standardised the power rail across this product family.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible hardware and confirmed the BMS handshake completes without fault codes. The protection circuit trips at the correct over-discharge threshold and recovers cleanly on reconnect to charge.
• Post-swap self-test protocol: After fitting this battery, allow the VIAFLO or VOYAGER to complete its full power-on self-test cycle without interruption. The device runs BMS verification at startup — cutting power during this sequence triggers a false battery fault that persists until the next clean reboot.

Why the VIAFLO reports a battery fault on a new cell that just came off the charger

The VIAFLO's BMS evaluates internal resistance and charge acceptance against thresholds calibrated to a fully conditioned OEM cell. A new Li-ion cell straight from storage has not yet settled — its internal resistance reads slightly high and its charge curve looks different from a broken-in cell. The instrument interprets this as a degraded or non-compliant battery and raises a fault. One full charge-discharge cycle normalises the cell's electrochemical behaviour, and the fault clears on the next startup.

Charge indicator stalling below 100% on first charge

On the first charge, the VIAFLO's charge IC applies a conservative current limit when it detects a cell that has not yet established a charge history. This causes the indicator to plateau at 85–95% and appear stuck. The cell is not faulty — the charge controller is running a cautious initial top-up rather than a full constant-voltage phase. Allow the device to remain on charge past the apparent plateau; the indicator will advance to 100% once the charge IC confirms the cell voltage has held steady at 4.2V for the required dwell period.