£68 Manufacturer Tylt, tylt.com
4 Tylt wanted to make a battery case that was more functional than its rivals’ offerings, and it largely succeeds with the Energi case – a standard battery case but with an inner, detachable, hard shell. This is the case for those who want to quickly clip on a battery case without the hassle of swapping out an everyday case. Just slide the hard shell inside the battery case and the Lightning connector holds it all in place. The case easily gives you a full charge cycle, but we found the rubber coating to be a little slippy. Christian Hall The first fundamental change to a battery case we’ve seen in years, and on the whole it works pretty well.