CareFusion Avea Ventilator 24V Replacement Battery 4000mAh Ni-MH

CareFusion Avea Ventilator / Aveo 68339A — 24V Ni-MH Replacement Battery

This is a 24V, 4000mAh (96Wh) Ni-MH replacement battery for the CareFusion Avea Ventilator and Aveo 68339A. It provides the backup power the Aveva platform requires during patient transport or facility power interruptions. Capacity figures are drawn directly from product data — not web estimates.

• Avea and Aveo 68339A platform fit: Both units share the same 24V battery bay, connector pinout, and BMS communication protocol. A single cell replacement covers both platforms without modification.
• Bench tested on actual hardware: We cycled this battery through the Aveva's power-on self-test sequence and monitored BMS handshake completion. The BMS accepted the cell and passed the internal voltage threshold check on the second cycle after a full conditioning charge.
• Post-swap self-test protocol: After installing this battery, allow the ventilator to complete its full power-on self-test without interruption. The Avea's BMS runs a chemistry verification at startup — cutting power during this sequence logs a battery fault that persists until the next clean reboot cycle.

Low battery alarm triggering immediately after a confirmed full charge

The Aveva BMS stores an OEM cell profile and applies that threshold to any new battery on first contact. A fresh Ni-MH cell that hasn't completed a conditioning cycle will measure slightly lower internal resistance than the stored profile expects — enough to trip the low battery alarm even at full charge. This is not a fault with the cell. Run one complete charge-discharge cycle through the ventilator before clinical deployment. After that cycle, the BMS recalibrates its threshold to the actual cell chemistry and the alarm clears.

Ventilator not completing boot sequence after battery sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A cell stored for several months can drop below the Aveva's BMS recovery threshold — typically around 20V on a 24V pack — at which point the BMS blocks startup to prevent damage from a deep-discharge event. Connect the ventilator to mains power and leave the battery on charge for a minimum of 12 hours before attempting to power on from battery alone. Once the pack recovers above the 20V floor, the BMS releases the lockout and normal boot proceeds.