One method that remains popular to improve smartphone and tablet battery life among some Android device users is the app killer, also known as the task killer. (lifewire.com)
But in 2013, the original iPad Air turned in the best tablet battery life I've ever seen on my test: 12 hours and 13 minutes — about 90 minutes longer. (recode.net)
We haven't had it long enough to do a complete battery rundown test on it, but in practice, we believe you'll get average tablet battery life out of it: between 7 and 9 hours, depending on what you're up to. (digitaltrends.com)