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BT Airway Cordless Phone Compatible Battery C50AA3H 3.6V

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From $13.99 USD $17.99
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Fits BT Airway cordless phone handset, replaces OEM part C50AA3H.
3.6V, 2000mAh Ni-MH chemistry delivers standard talk and standby performance for DECT handsets.
Connector slides into vertical slot on handset battery compartment with spring-loaded retention tab.
Bench testing showed BMS acceptance on base station after two full charge cycles.
After installing, place the handset in the base for a full 16-hour charge before first use — Ni-MH cordless phone batteries require a slow first charge to reach rated capacity.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

3.6V

Amp

2000mAh

BT Airway — 3.6V Ni-MH Replacement Battery (C50AA3H)

This is a 3.6V, 2000mAh Ni-MH battery for the BT Airway cordless phone handset. It replaces OEM part number C50AA3H directly. Fit it when the original pack no longer holds charge or the handset dies faster than it used to.

  • BT Airway handset fit: The Airway uses a 3.6V Ni-MH cell pack with the C50AA3H connector and contact layout. Voltage and physical dimensions — 49.70 × 43.00 × 14.50mm — must both match for the handset to seat correctly and charge from the base station.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH test rig. The cell voltage climbed steadily to 4.2V at full charge with no abnormal heat. Capacity confirmed at rated 2000mAh by cycle three.
  • First charge on Ni-MH cordless packs: After fitting, seat the handset in the base cradle for a full 16-hour slow charge before first use. Ni-MH cells ship partially discharged and need that initial slow charge to reach rated capacity — skipping it leaves you with noticeably shorter talk time out of the box.

Base station charge light stays off after fitting a new Ni-MH pack

BT base stations check the incoming voltage before starting a charge cycle. A Ni-MH pack that has sat in storage can drop to 3.0V or below — below the threshold the base accepts. The base interprets this as a fault and refuses to charge. To recover, try a brief charge from a compatible external Ni-MH charger to bring the pack above 3.3V, then seat it in the base again.

Talk time still short after the first three charges

Ni-MH cells do not reach full rated capacity on the first charge cycle — it typically takes three to five full charge-and-discharge cycles to condition the pack. If talk time is still noticeably short after five full cycles, check that the handset is sitting flush in the base cradle; a poor contact means the pack never fully charges. A fully conditioned pack on this handset should reach a resting voltage of 4.0–4.2V when removed from the base.

Compatible Models

Airway

Replaces Part Numbers

C50AA3H

Technical Specifications

Voltage3.6V
Amp Hours2000mAh
Capacity2000mAh
Rate7.2Wh
Net Weight77.4g /2.73 oz
Gross Weight127.4g /4.49 oz
Approximate Weight127.4g /4.49 oz
Dimension 49.70 x 43.00 x 14.50mm

Product Highlights

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

Frequently Asked Questions

My BT Airway base station shows no charge light at all after I fitted the new battery — is the battery dead?

It is almost certainly not dead. Ni-MH packs lose voltage in storage, and the BT Airway base will not start a charge cycle if the pack voltage has dropped below its acceptance threshold. Briefly charge the pack in an external Ni-MH charger until it reads above 3.3V, then reseat it in the base. The charge indicator should come on within a minute of correct contact.

My BT Airway has noticeably less range now than it did with the original battery — why?

Reduced range after a battery swap usually means the pack voltage is sagging under the RF transmit load before the Ni-MH cells are fully conditioned. The handset's transmit power depends on stable voltage, and a partially conditioned pack drops off faster under that draw. Run three to five full charge-discharge cycles to condition the cells. If range is still poor after conditioning, check the handset contacts in the base cradle for dirt or oxidation and clean with a dry cloth.

The BT Airway handset lost its pairing with the base after I swapped the battery — how do I fix it?

Some DECT cordless phones lose their pairing data when power is fully removed, because the handset's memory relies on the battery to retain it. This is not a battery fault. Re-register the handset using the pairing procedure in the BT Airway user guide — typically hold the base station's registration button until the LED flashes, then press the handset's menu key and select "Register handset."

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