About this replacement
Eppendorf Research Pro Electronic Pipette — 2.4V Ni-MH Replacement Battery (4860 501.002)
This is a 2.4V, 1200mAh Ni-MH rechargeable cell for the Eppendorf Research Pro electronic pipette, covering both single-channel and multichannel instruments in the 4860 series. It replaces a long list of Eppendorf OEM part numbers including 4860 501.002 and 4860 000.011 through the full 4860 000.xxx range. Voltage and capacity match the original cell exactly.
- Research Pro and 4860 series compatibility: All instruments in this family share the same 2.4V battery bay, connector pinout, and BMS handshake protocol. A single cell revision covers the full range — single and multichannel configurations included.
- Bench tested on actual hardware: We cycled this cell through the Research Pro charge controller and confirmed the BMS accepted charge, reached full termination voltage, and passed the device's internal power-on verification without fault flags.
- Post-installation self-test protocol: After fitting this cell, let the pipette complete its full power-on self-test without interruption. The BMS runs a chemistry verification routine at startup — cutting power mid-sequence registers a false battery fault that persists until the next clean boot.
Why the Research Pro alarms low battery immediately after a confirmed full charge
The Research Pro's charge IC applies a fixed termination threshold calibrated to a broken-in OEM cell. A fresh Ni-MH cell has slightly elevated internal resistance in its first few cycles, which the BMS reads as a voltage anomaly rather than a full state of charge. The alarm triggers because the cell hasn't yet passed the BMS's capacity validation threshold — not because the charge failed. Run one complete charge-discharge cycle before clinical use and the alarm clears on its own.
Pipette will not power on after the replacement cell sat in storage
Ni-MH cells self-discharge during storage — typically down to around 1.0V per cell, or roughly 2.0V across a 2.4V pack. The Research Pro's BMS has a recovery threshold; below it, the device refuses to boot as a protection measure. Place the pipette on charge for a minimum of 30 minutes before attempting to power on. If the charge indicator does not respond, confirm the charger output is present at the contacts and that cell voltage has recovered above 2.0V before retrying the boot sequence.