iPod touch Help. What happen with my iPod Touch 4th iOS 5?

[yeyehalim]

Hi, I'm a new user of white iPod Touch 4th gen with iOS 5.
I have a problem that when I use my iPod for gaming or something else, the pop-up windows show that the battery is critical in 20% and the battery indicator goes red. And I put my iPod to sleep. When I wakes it up, the battery indicator goes green again and the percentage increase.
Why my iPod Touch battery percentage can increase when I put it to sleep?
Is my iPod in a problem?
Or someone else have a same experience with me?
Thank you

 

[Ivan P]

I've owned several iPod touch models, and they've all done this. When you are using the iPod, especially during tasks that use the battery fairly rapidly (for example, playing games or using the internet), the software that monitors the battery thinks that the battery will run out quicker, which it will - but, once the iPod is put to sleep and the battery isn't being used as much the battery gauge becomes a bit more accurate as it isn't being run down as fast. This is why the battery level may seem to jump around depending on what you are actually using the iPod for. Nothing to worry about.