Hello is anyone using a T310?

I bought mine charged for 24 hours then left it on standby and it died
shortly after 24 hours has passed 24-30 hours range, I went to fido store
they changed my battery and I had the same problem, I came back they gave me
a brand new phone and still after like MAX 48 hours it died just on being on
standby, now I called CS and they mailed me out another T310 and said this
one should be fine.

Is anyone having similar problems with the battery on T310 and can I change
to another model ? Its already 1 month that I am on fido.

Thanks