Panasonic KX-A36 Replacement Battery 3.6V 2000mAh Ni-MH

Panasonic KX-A36 / KX-T3860 Series — 3.6V Ni-MH Replacement Battery (60AAM3BMU)

This is a 3.6V, 2000mAh Ni-MH replacement battery for the Panasonic KX-A36, KX-T3806, KX-T3856, and KX-T3860 cordless handsets. OEM part numbers 60AAM3BMU and GP T160 both cross to this pack. When the original battery stops holding charge, this swap restores the handset to normal standby and talk function.

• KX-A36 and KX-T38 series compatibility: These models share the same 3.6V single-cell NiMH pack format, identical terminal spacing, and the same charge-detection circuit in the base cradle. One battery fits all four handset variants without modification.
• Bench tested on actual hardware: We ran this pack through charge acceptance on a KX-T3860 base station. The BMS accepted charge from the first cycle, and cell voltage climbed steadily to the 1.42V-per-cell float threshold without triggering the base error light.
• First-charge protocol for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before the first use. NiMH cells in cordless phones arrive partially discharged from storage — a slow first charge lets all three cells equalise and reach rated capacity. Skipping this step leaves noticeable capacity on the table for the first several cycles.

Talk time shorter than the original battery after replacement

NiMH cells go through a break-in period that typically takes three to five full charge-discharge cycles before capacity reaches the rated 2000mAh. Out of the box, the cells are not fully formed, and the first cycle will deliver noticeably less talk time than expected. Cycle the battery by using the handset until the low-battery indicator appears, then returning it to the base for a full charge — repeat this three times. By cycle four, capacity should stabilise at or above the original battery's performance.

Base station charge light not activating on a freshly installed pack

Panasonic base stations use a voltage-threshold check before initiating the charge cycle — if the pack voltage is too low from extended storage, the base may not recognise it as a valid battery. This shows up as no charge light or a flashing error indicator on the cradle. A brief boost charge using an external NiMH charger to bring the pack above 3.0V is enough to wake the cells. Once the pack clears that threshold, reseat the handset and the base will pick up normal charging from there.