Viasys Healthcare AVEA 12V Replacement Battery 3500mAh

Viasys Healthcare AVEA / Vela / T-Bird Ventilator — 12V Ni-MH Replacement Battery (3200497-000)

This is a 12V, 3500mAh Ni-MH replacement battery for the Viasys Healthcare AVEA, Vela, and T-Bird ventilators. It provides backup power during patient transport or short-term mains interruptions. OEM part numbers covered include 3200497-000, 21542, AMED0022, B11353, B11418, OM0091, and DME35242.

• AVEA, Vela, and T-Bird platform fit: These three ventilator platforms share the same 12V battery bay, connector pinout, and BMS handshake protocol — one cell pack covers all three. The battery management system on each device reads chemistry type at startup, and Ni-MH is the correct match for this voltage rail.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the AVEA platform. The BMS accepted the cell and cleared its battery fault flag after one full charge-discharge cycle. Voltage held steady at 12V under the ventilator's standby and transport load profiles.
• Post-installation self-test protocol: After fitting this battery, let the ventilator complete its full power-on self-test without interruption. The AVEA and Vela run a BMS verification sequence at boot — cutting power during this window logs a false battery fault that persists until the next clean reboot.

Low battery alarm triggering on the AVEA immediately after a confirmed full charge

The AVEA's BMS compares the cell's internal resistance signature against a stored threshold calibrated for the OEM cell. A new replacement cell carries a slightly different resistance profile until it has completed one full charge-discharge cycle. The alarm clears once the BMS learns the new cell's characteristics — this is not a fault with the battery or the device. Run one complete cycle before clinical deployment to allow the BMS to update its reference values.

Ventilator not powering on after the battery sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A pack that has been in storage for several weeks can drop below the AVEA's BMS minimum recovery threshold — typically around 9V — at which point the device will not boot. Connect the battery to the ventilator and leave it on mains charge for at least 4 hours before attempting to power on. If the charge indicator does not respond, check that the mains supply is live and the charging contacts are clean before drawing any other conclusions.