Rainin E4 Pipette Replacement Battery 3.7V 1100mAh

Rainin E4 / E4 XLS+ Pipette — 3.7V Li-ion Replacement Battery (6109-031)

This 3.7V, 1100mAh lithium-ion cell replaces part number 6109-031 in the Rainin E4 and E4 XLS+ electronic pipettes. These are precision laboratory instruments used for liquid handling and sample preparation in clinical and research settings. The battery powers the onboard motor and control electronics that govern aspiration and dispensing cycles.

• E4 and E4 XLS+ platform fit: Both models share the same battery bay geometry, connector pinout, and BMS handshake protocol — a single cell serves both variants without modification.
• Bench tested on actual hardware: We ran charge-discharge cycles through the E4's control board and confirmed the BMS accepted the cell, logged correct state-of-charge data, and cleared all battery fault flags after one full conditioning cycle.
• Power-on self-test protocol: After installing this cell, let the pipette complete its full startup self-test without interrupting power. The E4's BMS runs a battery verification routine at boot — cutting power mid-sequence triggers a persistent false battery fault that will not clear until the next uninterrupted reboot.

Low battery alarm immediately after a confirmed full charge

The E4's BMS compares cell impedance and voltage recovery rate against stored OEM thresholds during self-test. A new replacement cell has not yet completed a conditioning cycle, so its internal impedance reads higher than the OEM reference — the BMS flags it as degraded even when the cell is fully charged. Run one complete charge-discharge cycle before clinical use. After that cycle, the BMS recalibrates its thresholds and the alarm clears. If the alarm persists past two full cycles, check resting voltage — it should sit at or above 3.6V open circuit.

Pipette will not power on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If the cell voltage drops below approximately 2.5V, the E4's BMS enters deep-discharge lockout and blocks normal startup to protect the cell. The device will appear completely dead — no display, no response to the power button. Place the pipette on its charging dock for a minimum of 30 minutes without attempting to power it on. The charger's pre-charge stage recovers the cell voltage above the BMS recovery threshold, typically 2.9V, at which point normal startup resumes.