The nook simple touch is a great e reader. It uses android and is root-able. Once rooted it can serve as a kindle as well. For this reason a lot of people are buying the nook simple touch.

Barnes and nobles advertises the nook as running 2 week on a single charge. Although its true when you buy it brand new, I have found out through personal experience that nook battery life degrades over time. So after a year or two of use the battery runs two or three days at best. After that period it comes to a state where it needs daily charging.

My battery burned up after two and a half years of constant use.

Signs of a dead nook battery are that the screen remains stuck forever at a single image and taking out the battery and re-plugging it doesn't make any difference. Also the orange charging light remains lit forever.

Fortunately changing the battery of nook is very easy as the internal components are not complex.

Nook battery replacement are widely available online. But buying these batteries might not be feasible for everyone.

This guide will show you how to use any non-nook, generic battery with a NST to run it again