I've had a new M8 for a few days now and I love it

. The image quality is absolutely astounding. However I think it
MAY have a problem and I'm hoping other M8 users might help me here:
When I got it I charged the battery fully and the camera indicated a full charge (3 bars). I used it a bit and then recharged (still showed 3 bars). I read the manual and it said you should fully discharge the battery and then fully re-charge it to maximize battery life. So thinking I'd quite like to maximize the battery life I run it down 'til it was dead - mostly by leaving the LCD monitor on. This time after a full recharge it only showed 2 bars

. Hmmm. I went out and shot with it and after a bit of street shooting it was down to 1 bar

. Not good.
Currently a full recharge = 2 bars
After about 85 shots (without much chimping) = 1 bar
Then it seems to go on for a long time on 1 bar. Not tested it all the way but certainly over 250 shots.
How does this compare with your M8? I've read something a bit similar from another user but would like some feedback from more users before I take it back (I have to say I really don't want to be without it for weeks). I've ordered a 2nd battery anyway but won't get it for a couple of weeks.
Is this a fault? Will it sort itself out with use? How is your battery life? Your opinions please.
Thanks.