Ipod touch battery meter

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Is anyone having trouble with their batter level and the accuracy of it? Like sometimes when I leave it plugged in all night and I unplug it in the morning it'll show that it's only at 10% battery level and once I let it run for a few minutes (and sometimes hours) it'll show 100%. There have also been times when I plug it to charge and it shows it's at full capacity when it had just died. I was just wondering if anyone else was having this problem. I have a 2nd gen ipod touch. help?