Nortel C4065R Cordless Phone Replacement Battery 2.4V 600mAh

Nortel C4065R — 2.4V Ni-MH Replacement Battery (NTTQ49MAE6)

This is a 2.4V 600mAh Ni-MH replacement battery for the Nortel C4065R cordless phone handset. It matches the OEM part number NTTQ49MAE6 and fits directly into the C4065R handset battery compartment. Voltage, capacity, and connector align with the original Nortel specification.

• C4065R handset compatibility: The C4065R runs on a 2.4V two-cell Ni-MH pack with a specific footprint — 35.80 x 33.50 x 7.00mm. This battery matches that cell configuration and connects to the same charging circuit the base station expects. A voltage mismatch here prevents the base from initiating charge.
• Bench tested on actual hardware: We cycled this pack through the C4065R base station and confirmed the charging circuit accepted the battery without error. The BMS completed charge termination correctly at full capacity.
• First charge on NiMH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before use. NiMH cells in cordless phones need that slow first charge to reach rated capacity — skipping it shortens talk time from the first day and the cells rarely recover.

Talk time shorter than original battery after replacement

New NiMH cells arrive partially discharged from storage and don't hit rated capacity on the first cycle. The C4065R base station charges at a low trickle rate, so the first few cycles condition the cells gradually. Rated 600mAh capacity typically isn't reached until cycles three to five. Run the handset to low charge, return it to base for a full charge, and repeat — talk time improves with each cycle.

Base station shows no charge or error light after swap

When a NiMH pack has been in storage, its resting voltage can drop below the threshold the C4065R base uses to detect a valid battery. The base reads the voltage on first contact — if it's too low, charging never starts and the indicator stays off or shows a fault. Remove the handset, wait 10 seconds, and reseat it firmly. If the base still won't initiate charge, check the handset contacts are clean and making full contact with the cradle pins.