3310 uses to much battery power

i have a 3310 v5.45 that runs a fully charged battery flat in about 1 day the fault can`t be in the battery as i have purchased a new one and put that in another 3310 and that is fine so i tried swapping batteries from one to the other and found both batteries were ok in one of the 3310`s and both batteries only lasted a day in the problem phone. has anyone come across this before and is there a reason, any help would be gratefully received.
regards Dave

PA?

yes,u should try change PA.that should probably be the reason
PA want to drain out the battery

what is PA?

PA - Power Amplifier

thanks Al and dbrus12 i will give that a go (hope this is easy not an expert with a soldering iron):)