KX-T3930 Panametric Cordless Phone Replacement Battery 3.6V 600mAh

Panametric KX-T3930 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 600mAh Ni-MH replacement battery for cordless phone handsets using the KX-T3930 part number. It slots into the handset battery compartment and restores wireless talk and standby capability. Check your existing battery for the KX-T3930 label before ordering.

• KX-T3930 handset compatibility: Cordless phone handsets in this family share the same 3.6V single-cell Ni-MH voltage rail, connector pinout, and physical footprint — that is why one part number covers multiple handset models across the range.
• Bench tested on actual hardware: We cycled this pack on a 3.6V Ni-MH handset platform and confirmed the base station accepted charge current without fault, the BMS held stable voltage through standby draw, and capacity tracked to rated spec by cycle four.
• First charge on NiMH cordless handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cordless batteries ship partially discharged and need a slow, uninterrupted first charge to reach rated 600mAh capacity — skipping this step is the most common cause of short talk time complaints.

Why talk time stays short for the first few uses after a battery swap

Ni-MH chemistry requires several charge and discharge cycles before the cells reach full rated capacity. A new pack will typically deliver noticeably shorter talk time for the first three to five cycles — this is not a fault with the battery. Each full cycle builds the electrochemical structure inside the cells. By cycle five, capacity should be at or close to the rated 600mAh.

Base station shows no charge or error light after new battery installed

Ni-MH batteries lose voltage during storage, and some base stations will not initiate a charge cycle if the pack voltage is too low on first contact. The base station's charge controller interprets a deeply discharged pack as a fault condition. To recover, remove the battery, let it sit at room temperature for ten minutes, then re-seat it firmly and place the handset back in the base. If the base still shows an error, check that the battery contacts on both the handset and the base cradle are clean and making solid contact — a resting voltage below 3.0V will trigger rejection on most charge controllers.