Another major battery drain on Kindles (and smartphones too) is 3G left on when you live in a marginal coverage area or it is at least marginal within your house/workplace. I have to keep my 3G turned off on my Kindle DXG because it has trouble getting and keeping a 3G connection with our terrible AT&T service. Our cellular phones also have this issue. If the 3G radio spends a lot of time trying to connect you will see a significant battery drain. This isn't Amazon's fault. In my case it is the fault of a lackluster and outdated AT&T cellular infrastructure that has been overly burdened by the meteoric rise in use of smatphones.