UK consumer watchdog site Which? has tested the world's leading tablets to see how their battery life compares and both the iPad with Retina display and the iPad mini came out on top by a large margin.
To be fair to all tablets, Which? took into account the screen size and brightness of each one. First, testers divided the tablets into two categories: those with screen sizes of 9.4-inches and larger and those with screen sizes of 7.9-inches and smaller. Then the company used a light meter to set the screen brightness of each tablet to 200 nits. For its tests, Which? measured the battery life of the tablets while usi
