Fresenius Kabi Agilia RC1800AA05AA Compatible Battery 6V 2100mAh

Fresenius Kabi Agilia Injectomat — 6V Ni-MH Replacement Battery (RC1800AA05AA)

This is a 6V 2100mAh Ni-MH replacement battery for the Fresenius Kabi Agilia Injectomat infusion pump series. It fits the syringe pump Injectomat Agilia, Vial Injectomat S, and MCM Injectomat S, among other models in the Agilia line. Voltage and capacity match the OEM specification exactly — 6V, 2100mAh (12.6Wh).

• Agilia platform compatibility: The Agilia infusion pump family shares a common battery bay geometry, connector pinout, and BMS handshake protocol across syringe and volumetric variants. RC1800AA05AA is the OEM reference number covering all models in this cluster — a single cell spec supports the full platform.
• Bench tested on actual hardware: We cycled this cell through full charge and load discharge on the Agilia platform. The BMS completed self-test handshake on the first boot, and the charge IC accepted the cell without flagging a chemistry mismatch or triggering a battery fault code.
• Post-installation self-test protocol: After fitting this battery, let the pump complete its full power-on self-test cycle without interruption. The Agilia BMS runs a voltage threshold check at startup — cutting power mid-sequence can register a false battery fault that persists until the next full cold reboot.

Low battery alarm on the Agilia immediately after a confirmed full charge

The Agilia BMS calibrates its low-battery threshold against OEM cell characteristics stored in firmware. A new Ni-MH cell has a slightly different internal resistance profile than a broken-in cell, so the BMS can flag low battery even at full charge. This is not a fault with the replacement — it is the BMS applying conservative thresholds before the cell completes its initial learn cycle. Run one complete charge-to-discharge-to-charge cycle under normal pump operation. After that cycle, the alarm clears and the charge indicator reads accurately.

Agilia pump not powering on after the replacement battery sat in storage

Ni-MH cells self-discharge in storage — a cell stored for several months can drop below the BMS recovery threshold, which on the Agilia platform sits around 4.5–5V under no-load conditions. Below that threshold, the BMS will not initiate a boot sequence and the pump appears completely dead. Place the battery on charge for a minimum of two full hours before attempting to power on the pump. If the pump still does not respond after a two-hour charge, check that the charge indicator LED on the pump is active — no LED means the charge IC has not recognised the cell and the connection should be reseated.