Wow, sorry that happened @sirmaru, and I hope you get your new one soon. There does seem to be battery issues in general with the Android OS which I hope they get fixed. I've got two Android 2.3.x devices and they can be somewhat unpredictable on battery charges, but the Fire is much more stable than my Motorola Atrix phone!

One thing that we should keep in mind is that in general it is a good idea to never let a Lithium Ion or Lithium Polymer battery discharge below 50%. Doing so reportedly lessons the life of the battery. I've read that this is why Toyota and other car manufacturers use twice the battery capacity functionally needed in their hybrids. They don't do this to extend your range of driving but because they want you to recharge no later than at 50% capacity in order to extend the life expectancy of batteries which cost many thousands of dollars.