What's causing this?

[jmcarrillo]

I have a second hand Treo 600. Shortly after I got it I realized that the battery the battery died after one phone call. I used it as a PDA and not a phone for a while and it performed much better. However, the same thing soon started happenning. I replaced the battery about a month ago, it worked great both phone and PDA functions, until last Friday.

First, there was alot of noise on the line, so I though may be an antenna problem. Then I couldn't even answer calls, the answer button the screen wasn't working. Then the battery charge suddenly disappearred and the phone shut down. I openned it reseated the battery and charged it. As soon as I plugged it in the charge went to 40% (not a good sign), it took only 5 mins to charge (another not good sign). I launched one app and the charge again disappeared. I recharged it. The same thing happenned.

What's happenning, can it be fixed?

This device is very important to me, please help.