AudioVox AT22R Cordless Phone Replacement Battery 4.8V 1300mAh

AudioVox AT22R — 4.8V Ni-MH Replacement Battery

This is a 4.8V 1300mAh Ni-MH battery pack for the AudioVox AT22R cordless phone handset. It slots directly into the handset battery compartment and restores full talk and standby function. Voltage and cell count match the original pack specification.

• AT22R handset compatibility: The AT22R runs on a 4.8V rail with a four-cell Ni-MH configuration. This pack matches that voltage and the physical footprint at 56.50 x 50.38 x 14.56mm, so the compartment door closes correctly and the contacts align.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on Ni-MH test equipment. The BMS accepted charge current normally, and cell balance held across all four cells without voltage deviation at cutoff.
• First charge on AT22R handsets: After installing, seat the handset in the base cradle for a full 16-hour charge before first use. Ni-MH packs ship partially discharged, and the AT22R base charges at a slow trickle rate — a short first charge will not bring cells to rated capacity.

Base station showing no charge or error light on a new Ni-MH pack

Ni-MH packs lose voltage during storage and shipping. If the pack voltage drops low enough, the AT22R base station's charge detection circuit may not recognise it as a valid battery. The base looks for a voltage response in a specific window when it first applies charge current. A pack sitting below roughly 3.6V total may not trigger that window, so the base shows no charge activity or an error indicator instead of a charge light.

Talk time shorter than the original battery after replacement

Ni-MH cells do not deliver full rated capacity until they have been through three to five full charge and discharge cycles. A new pack will feel weaker than the old original in the first few uses — that is normal cell conditioning, not a fault. Run the handset until the low-battery alert sounds, then return it to the base for a full charge. Repeat this three to five times and capacity will stabilise at the 1300mAh rating.