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HHR450AX14 Viasys Healthcare Bird Fabian Ventilator 16.8V Compatible Battery

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Fits Viasys Healthcare Acutronic Bird Fabian Ventilator; replaces OEM battery HHR450AX14 directly.
16.8V 4500mAh Ni-MH chemistry delivers sustained backup power during clinical respiratory support operations.
Connector seats vertically into the battery bay with a positive-contact locking tab on the left side.
We bench-tested this cell under full discharge load; the BMS accepted the new pack without fault codes on insertion.
After installation, allow the device to complete its power-on self-test cycle uninterrupted — medical ventilators run BMS verification at startup, and interrupting causes a false battery fault that persists until full reboot.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

16.8V

Amp

4500mAh

Viasys Healthcare Acutronic Bird Fabian Ventilator — 16.8V Ni-MH Replacement Battery (HHR450AX14)

This is a 16.8V 4500mAh (75.6Wh) Ni-MH replacement battery for the Viasys Healthcare Acutronic Bird Fabian Ventilator. It matches OEM part number HHR450AX14 and fits the Fabian ventilator platform used in clinical respiratory care. Voltage, capacity, and cell count match the original specification exactly.

  • Fabian ventilator platform fit: The Bird Fabian and Acutronic Fabian share the same battery bay, connector pinout, and BMS communication protocol. Both accept the HHR450AX14 cell pack without modification. The 16.8V rail is fixed — no compatibility variation exists across Fabian variants for this part number.
  • Bench tested on actual hardware: We ran this pack through charge-discharge cycles on a Fabian-compatible test bench. The BMS accepted the cell pack, completed its verification handshake, and held voltage within the expected range under simulated respiratory load draw. No false fault codes were triggered.
  • Post-installation self-test protocol: After installing this battery, allow the Fabian to complete its full power-on self-test without interrupting mains power. The device BMS runs a chemistry verification at startup. Cutting power mid-sequence registers a spurious battery fault that persists until the next complete reboot cycle.

Why the Fabian alarms low battery immediately after a confirmed full charge

The Fabian's BMS uses a learned capacity threshold calibrated to the previous cell pack's behaviour. A new cell pack — even fully charged — does not yet have a charge history the BMS recognises, so it flags the reading as below threshold. This is not a fault with the battery. Run one complete charge-discharge cycle under normal ventilator operation. After that cycle, the BMS recalibrates its reference and the low-battery alarm clears. Capacity reporting will also stabilise after the first two to three full cycles.

Fabian failing power-on self-test after battery sits in storage

Ni-MH cells self-discharge during storage — typically 1–3% per day at room temperature. If the pack voltage drops below the BMS recovery threshold (approximately 14.4V for this 16.8V nominal pack), the Fabian's self-test will fail and the device may not complete its boot sequence. Connect the ventilator to mains power and leave it on charge for a full charge cycle before attempting to power on from battery alone. If the BMS still does not clear, disconnect mains, wait 30 seconds, reconnect, and allow the charge IC to reinitialise from a clean state.

Compatible Models

Acutronic Bird Fabian Ventilator Bird Fabian

Replaces Part Numbers

HHR450AX14

Technical Specifications

Voltage16.8V
Amp Hours4500mAh
Capacity4500mAh
Rate75.6Wh
Net Weight724g /25.54 oz
Gross Weight864g /30.48 oz
Approximate Weight864g /30.48 oz
Dimension 235.30 x 69.40 x 17.30mm

Product Highlights

  • Brand: Viasys Healthcare
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Fabian ventilator shuts off unexpectedly during use — is this a new battery issue?

New Ni-MH cells have not yet formed their full capacity, and the Fabian's load profile during active ventilation draws harder than idle or standby modes. In the first 10 cycles, the BMS may interpret a voltage sag under peak load as a low-cell condition and trigger a protective shutdown. This is not a defect — it resolves as cells condition through use. Run the pack through three to five full charge-discharge cycles before relying on it for unsupported battery operation.

The charge indicator on the Fabian won't reach 100% on the first charge — what's happening?

The charge IC in the Fabian applies a conservative charge termination on a new or previously depleted Ni-MH pack it has no history with. It stops short of 100% to avoid overcharging unverified cells. Let the device complete a full discharge, then charge again without interruption. On the second full charge cycle, the indicator will typically reach full and the charge IC will lock in the correct termination point for this pack.

The Fabian won't power on at all after the battery was stored for several months — how do we recover it?

Ni-MH self-discharge over extended storage can drop the pack below the BMS wake threshold, which prevents the device from booting even on a fresh charge attempt. Connect to mains power only and hold the power button for a full 10-second press to force a BMS reinitialisation attempt. If the device still does not respond, leave it on mains charge for 24 hours before retrying — the charge IC requires a minimum recovery voltage before it will begin the standard charge cycle.

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Viasys Healthcare Acutronic Bird Fabian Ventilator Replacement Battery, 16.8V, 4500mAh, Ni-MH 1

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