Thermo Scientific 2215640 E1 Pipette Replacement Battery 3.7V 1350mAh

Thermo Scientific E1 Clip Tip 4671 Single Channel — 3.7V Li-Polymer Replacement Battery (2215640)

This 3.7V, 1350mAh lithium-polymer cell replaces the OEM battery in the Thermo Scientific E1 Clip Tip electronic pipette series. It fits the 4671 Single Channel, 4672 Multichannel, and 16-channel Matrix variants. The cell powers both the dispensing motor and the onboard electronic controls that govern aspiration and dispense volumes.

• E1 Clip Tip series compatibility: The 4671, 4672, and Matrix pipettes share a common battery bay, connector pinout, and BMS communication protocol — all three models draw on the same voltage rail and use identical charge-termination logic, so one cell covers the full lineup.
• Bench tested on actual hardware: We cycled this cell through the E1 Clip Tip charge sequence and confirmed the BMS accepted the cell without fault codes, hit full charge-termination voltage at 4.2V, and passed motor-load draw without a low-voltage cutoff trigger.
• Post-swap self-test protocol: After installing this cell, let the pipette complete its full power-on self-test without interruption. The BMS runs a chemistry verification step at startup — cutting power mid-sequence causes a false battery fault that latches and persists until the next clean reboot.

Charge indicator stalling below 100% on the first charge

The E1 Clip Tip charge IC applies a conservative current limit when it first encounters a new cell whose internal resistance hasn't settled. On the first charge cycle, the IC may hold at 95–99% for an extended period before terminating. This is the charge IC behaving correctly — it waits for the cell to accept a trickle top-up below 50mA before logging a full charge. Run one complete charge-to-discharge-to-charge cycle and the indicator will reach 100% normally on subsequent charges.

Pipette shuts off mid-dispense after the first few cycles

New lithium-polymer cells have slightly elevated internal resistance in the first 5–10 cycles, which causes a sharper voltage sag under the motor's peak draw during aspiration or fast dispense. The BMS interprets that sag as a low-cell-voltage event and cuts output to protect the cell. The fix is straightforward: complete 5 full charge-discharge cycles before clinical use. After conditioning, internal resistance drops and the sag stays above the 3.0V BMS cutoff threshold under normal motor load.