Labnet AK01 Single Channel Pipette Replacement Battery 3.7V 850mAh

Labnet Single-Channel Pipettes — 3.7V Li-ion Replacement Battery (AK01)

This is a 3.7V, 850mAh Li-ion replacement battery for the Labnet single-channel electronic pipette. It fits the single-channel model using OEM part number AK01. The cell is 40.20 × 35.30 × 6.10mm and slots into the handle where the original pack sits.

• Single-channel pipette fit: Labnet's single-channel electronic pipettes run a low-voltage 3.7V rail with a BMS that checks cell chemistry at startup. This replacement matches that voltage and cell format exactly, so the BMS handshake completes without a fault code on boot.
• Bench tested on actual hardware: We cycled this cell through the pipette's charge IC and confirmed the BMS completed its verification sequence. The cell held 850mAh at rated voltage across the first three discharge cycles with no thermal cutoff or fault flag.
• Post-swap startup routine: After installing this battery, let the pipette run its full power-on self-test without interrupting it. The BMS runs a chemistry verification at startup — cutting power mid-sequence locks in a false battery fault that won't clear until the next complete reboot.

Charge indicator not reaching 100% on the first charge after swap

Labnet's charge IC applies a conservative current limit on cells it hasn't profiled yet. On the first charge, it terminates early — typically between 85–95% — rather than risk overcharging an unknown cell. This is normal behaviour, not a fault. Run one full charge-discharge cycle and the IC adjusts its termination threshold to the new cell's actual capacity. After that first cycle, the indicator should reach 100% consistently.

Pipette alarming low battery immediately after a confirmed full charge

The low-battery alarm threshold in Labnet electronic pipettes is calibrated against the internal resistance profile of a conditioned OEM cell. A new replacement cell hasn't completed its BMS learn cycle yet, so even at full charge its internal resistance reads higher than the BMS expects — triggering the alarm incorrectly. This isn't a defective battery; it's the BMS applying its OEM threshold before the cell has been profiled. Run one complete charge-discharge cycle, then recharge fully to 4.2V before returning the device to use.