Note: In step 4, remove only 1/4” insulation from both wires.

I recommend obtaining a 2 cell AAA battery pack replacement for a cordless phone. The one I purchased was a Kastar 1000 mAh Phone Battery for Uniden BT-1008 BT-1016 BT-1021 BT1025. The pack is prewired, so there is no need to deal with trying to solder the tabs which is difficult. All I had to do was:

1) Remove the shrink wrap casing from the battery pack

2) desolder the wires attaching to old battery pack from the circuit board.

3) Cut off the plug-in connector from the new battery pack

4) strip the insulation off of both the red and black wires from the new battery pack.

5) solder the red and black wires of the new battery pack to the points where the old wires were. Note: it will be helpful to have a solder sucker to remove any old solder from the pass thru holds for the battery wires.

The batteries fit perfectly and performance is excellent.