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Welcome Bill,None of us have had our Nexus 7s for 5 months yet, so no one knows about longevity issues. Electronic device failures typically appear early (ergo 'infant mortality'), and are covered by warranty, so I've personally never bought an extended warranty.Your battery problem is probably from an app gone wild. Go to Settings > Battery, and note what's running. Screen should account for ~95% of battery use when sleeping. If it's down to about 70%, something else is using an inordinate amount of your battery life. Typically, the battery hog shows as something generic - perhaps Android OS or Media Services.To identify the battery hog, go to Settings > Apps > Running tab, and note which apps are running. Close everything you don't need. That should fix your problem. Or install OS Monitor to identify operating processes.Normally, you should be able to let your N7 start the night with a 60% charge, and see ~50% in the morning. Drawing it down to 0% ten nights in a row likely will damage your battery.