E61 - what's wrong with the battery life?

So this is what happened:

I had my phone on the charger all night.

This morning, I thought it was full but driving to work, I noticed the battery indicator only half-full.

I come back and put it on the charger and go to the gym for 60 mins.

I come back and see the indicator is half full and pull out-push in the charger again and get "Battery is full" message.

Then I use the phone for 20-25 mins and the "battery low" message pops up.

WTF?
 
That's what's killing me - i've sent maybe 3-4 txt messages, used the phone for 40-50 mins of talk time cumulatively, got misleading "battery is full" messages. Did i get a bad phone or what?
 
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