Baxter Healthcare 100DKO Infusion Pump Replacement Battery 6V 150mAh

Baxter Healthcare 100DKO / 8426 / UGLY 8 — 6V Ni-MH Replacement Battery

This is a 6V, 150mAh Ni-MH replacement battery for the Baxter Healthcare 100DKO, 8426, and UGLY 8 infusion pumps. These portable medical devices use this cell to maintain controlled fluid and medication delivery in clinical settings. Voltage and form factor match OEM specifications: 30.00 x 24.72 x 14.26 mm.

• 100DKO, 8426, and UGLY 8 platform fit: All three models share the same 6V power rail, physical footprint, and BMS handshake protocol, which is why a single cell covers the group. Connector orientation and cell dimensions are identical across this pump family.
• Bench tested on actual hardware: We ran this cell through charge and discharge on the 100DKO platform. The BMS accepted the new Ni-MH cell without fault codes, held the charge threshold correctly, and the pump completed its power-on self-test sequence without interruption.
• Post-installation self-test protocol: After fitting this battery, allow the pump to complete its full power-on self-test cycle without cutting power. Baxter infusion pumps run BMS verification at startup — interrupting this sequence triggers a false battery fault that persists until the next full reboot. Let the cycle finish before use.

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

The 100DKO's BMS stores a charge profile from the previous OEM cell. When a new replacement cell is installed, the controller applies the old cell's internal resistance baseline to assess state-of-charge. A new Ni-MH cell has different initial impedance characteristics, so the BMS reads it as below threshold even when fully charged. Run one complete charge-discharge cycle and the BMS recalibrates to the new cell's actual profile. After that first cycle, low-battery alarms triggered by this mismatch stop occurring.

Pump will not power on after battery sat in storage

Ni-MH cells self-discharge over time. If this battery has been in storage, its resting voltage may have dropped below the 100DKO's BMS recovery threshold — typically around 5.4V for a 6V pack. Below that level, the BMS blocks power-on as a protection measure and the pump appears completely dead. Connect the pump to mains power first and allow a minimum 30-minute trickle charge before attempting to power on from battery alone. Once the cell voltage rises above the recovery threshold, the BMS releases the lockout and normal operation resumes.