We bought a set of Panasonic phones from Costco after we moved to Wetaskiwin - about 4 years ago, maybe 4.5. The thing I HATE about cordless phones is that it is generally more expensive to replace the batteries than it is to buy new phones. So when phone #1 (of 3) stopped keeping a charge, I put it away without even looking at the battery. Then the other day I noticed that phone #2 wasn't holding a charge. With only one phone left, I thought maybe I should look into the cost of batteries.
Imagine my surprise when I opened up the back and saw two rechargeable AAA batteries. No "special" battery needed. The batteries are Ni-MH batteries and were replaceable (2 sets) for $15 at Wal Mart (we live in a small town, the only place to buy anything tends to be Wal Mart - I wouldn't shop there if I had other, close options).
So I don't have to throw the phones into the landfill and buy new ones. Yay!! Charged up phone #1 and it is working! I'm so very happy that the Panasonic corporation went to AAA batteries and not the ones that cost $30 each.
Of course, you can't use anything other than an Ni-MH battery. Nickle Cadmium won't work in the same charger.