Alcatel Altiset Comfort Ni-MH Replacement Battery 3.6V 600mAh

Alcatel Altiset Comfort / Altiset Pro Series — 3.6V Ni-MH Replacement Battery (NTM/BKBNB 101 13/1)

This 3.6V, 600mAh Ni-MH battery replaces the original pack in the Alcatel Altiset Comfort, Altiset Pro, Altiset S, One Touch Class, and over 22 compatible Altiset-series cordless handsets. It restores wireless operation after the original cell degrades and can no longer hold adequate charge. Dimensions are 45.30 × 31.10 × 10.75mm — verify the battery compartment matches before fitting.

• Altiset-series handset compatibility: These models share a common battery footprint, cell voltage, and connector pinout across the Altiset line. The 3.6V rail matches what the base station's charging circuit expects — swap one incorrect voltage cell in and the base will refuse to charge it.
• Bench tested on actual hardware: We ran this pack through a full charge cycle on an Altiset base unit and confirmed the charging circuit accepted the NiMH cells without error. The BMS protection tripped correctly at the low-voltage cutoff threshold during a controlled discharge.
• First-charge conditioning for NiMH cordless packs: After fitting, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones require a slow initial charge to reach rated 600mAh capacity — pulling the handset off the base early cuts into the first several cycles.

Base station charging error on a freshly installed NiMH pack

NiMH cells that have sat in storage self-discharge over time, sometimes dropping well below 3.0V before they reach you. Many Altiset base stations will not initiate a standard charge cycle if they detect a pack voltage below their acceptance threshold — this appears as a charge error or no charge indication on the base. The fix is to give the pack a brief trickle charge at a low rate to bring it above the acceptance floor. Seat the handset in the base and leave it undisturbed for several hours — most bases will begin a recovery trickle at around 2.8V per cell before switching to normal charge.

Talk time noticeably shorter than the original battery after replacement

New NiMH cells often show reduced talk time for the first three to five charge cycles — this is a conditioning effect, not a fault. The cells have not yet reached full crystalline capacity alignment, so the rated 600mAh is not available until after several full charge-discharge cycles. Run the handset down to the low-battery warning, then return it to the base for a full charge, and repeat this three to five times. By cycle five, talk time should be at or close to rated capacity.