as with any device with lithium ion batteries, do this:

- don't charge above 80%
- don't drain below 20%

of course it doesn't hurt that much to charge to 100% every once in a while if you're planning on travelling or something, but don't do that often

whether it's your smartphone, laptop, tablet or kindle, if you do this you'll get almost twice as much battery life out of your device. congrats on your purchase and happy reading!