E-readers like Kindles only use power when the content of the screen changes.
Because of that, Kindles have a long battery life.
That means you probably need to charge it every few days or weeks rather than once a day.
Still, Business Insider reports there are a number of ways to save the battery life on your Kindle--especially if it's aging and the battery is wearing out.
Keep your reading light as low as possible, and put your Kindle to sleep when you're not using it.