AT&T EL41108 Cordless Phone Replacement Battery 3.6V 600mAh

AT&T EL41108 / EL42208 Series — 3.6V Ni-MH Replacement Battery (89-1332-00-00)

This is a 3.6V, 600mAh Ni-MH battery for AT&T cordless phone handsets. It replaces OEM part 89-1332-00-00 and fits the EL41108, EL41208, EL42108, EL42208, and four additional models in this series. When the original pack degrades and the handset stops holding charge, this unit restores full cordless operation.

• EL41000 and EL42000 series fit: These models share the same 3.6V single-cell NiMH pack, connector orientation, and physical footprint. The base station charges at a fixed current matched to this chemistry and cell count — swapping in a different voltage or chemistry will cause a charging fault.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on an EL-series handset. The BMS accepted the NiMH voltage without triggering a fault, and the base station's charge indicator lit correctly after seating the handset.
• First-charge protocol for NiMH handsets: Place the handset in the base cradle for a continuous 16-hour charge before first use. NiMH cells arrive partially discharged from storage — a slow full charge on the first cycle sets the baseline capacity. Interrupting this charge and using the phone early shortens the effective capacity you get from each subsequent charge.

Base station showing no charge light after installing a new NiMH pack

NiMH cells that have sat in storage self-discharge to a low resting voltage — sometimes below the threshold the AT&T base station uses to confirm a valid battery is present. The base reads the voltage on contact and will not begin a charge cycle if that reading is too low. To recover, briefly connect the handset to a USB power source or use a standalone NiMH charger to bring the cell voltage up to approximately 1.1–1.2V per cell (3.3–3.6V total), then reseat it in the base. The charge indicator should activate within a few seconds of correct seating.

Handset losing range shortly after a battery swap

Reduced range after a battery replacement usually points to voltage sag under RF transmit load — not a faulty unit. DECT handsets draw a spike of current each time they transmit, and an under-conditioned NiMH pack cannot sustain the voltage rail through that spike. The RF output drops, and the handset's effective range shrinks. Run three to five full charge-and-use cycles to allow the cells to reach rated capacity, then retest range from the same distance.