A:AnswerYES...each handset has a special battery that RECHARGES when the handset is in its recharge cradle base. Eventually, the battery will not hold a charge and you can reorder a new one through AT&T's website. I know that the recharge bases/cradles for some of the cordless AT&T products are 'cross-compatible'. Its possible that the batteries are as well.
A:AnswerThe manufacturer said it can be extended up to 6 phones, although I have not done this myself.
To buy additional phones:
1. Use Best Buy search function, search for "portable phones".
2. Use filter function to list from lowest to highest priced.
3. Expansion phones cost less than systems and will list first.
4. Determine the model you have or want.
5. Purchase the compatible expansion model.
A:AnswerNot by it's self. The phone has Bluetooth to sink your cell phone which will allow these land line phones to sound out what your cell does, ie, timer, alarm clock, and calls.