Rainin PX-100 Replacement Battery 2.4V 700mAh Ni-MH

Rainin Controller PX-100 / Pipet-XTM — 2.4V Ni-MH Replacement Battery (17011746)

This is a 2.4V, 700mAh Ni-MH rechargeable battery for the Rainin Controller PX-100 and Pipet-XTM electronic pipette controllers. These handheld devices are used for automated liquid handling in laboratory and clinical environments. The OEM part number is 17011746.

• Controller PX-100 and Pipet-XTM compatibility: Both models share the same 2.4V two-cell Ni-MH battery architecture, connector pinout, and BMS handshake protocol — a single replacement cell services either platform without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a PX-100 controller. The BMS accepted the cell on the first insertion, completed its voltage verification pass, and held charge without triggering a false-low alarm after one full conditioning cycle.
• Post-swap self-test protocol: After fitting this battery, allow the controller to complete its full power-on self-test without interruption. The PX-100 runs a BMS verification sequence at startup — cutting power during this window writes a fault flag that persists until the next clean reboot, even if the battery is otherwise functional.

Why the PX-100 alarms low battery immediately after a confirmed full charge

The PX-100's charge controller uses a voltage threshold calibrated to a conditioned OEM Ni-MH cell. A new replacement cell has a slightly different internal resistance profile in its first few cycles, which causes the BMS to read terminal voltage as lower than actual state of charge. This triggers the low-battery alarm even when the cell is fully charged. One complete charge-discharge cycle brings the cell's voltage curve into range and clears the false alarm without any manual reset.

Controller will not power on after the replacement cell sat uninstalled in storage

Ni-MH cells self-discharge at roughly 1–3% per day when stored outside the device. If the replacement sat long enough, terminal voltage can drop below the PX-100's BMS recovery threshold — typically around 2.0V for a 2-cell pack — and the controller refuses to boot. Place the battery in the charger for a minimum of 15 minutes before insertion; most charge ICs will push a trickle current that lifts the cell above the BMS floor and allows normal startup. If the controller still will not boot, check terminal voltage with a multimeter and confirm the pack reads above 2.1V before proceeding.