What does that mean overall? Well, the Samsung Galaxy S7 Edge offers decent battery life, no doubt about that. Ultra power saving mode is there for emergencies, but we've found this is best used when you know you're going to need the phone running for long periods of time well before things get critical – it doesn't seem to extend battery life too much if you enable it when you're down to single digits. You can choose to have the basic power saving mode kick in at any point from 25% downwards, and this helps to eke out a little more battery life. ![]() Samsung's claim of 13 hours of HD movie watching seems a bit over the top, but then we did run the test with the phone connected to Wi-Fi and cellular, as most people would do enabling Flight Mode would have improved things even further. Intriguingly, the Galaxy S7 Edge fared just as well as its predecessor, showing a very impressive 14% drop. Let's talk numbers here: we ran our standard battery test, charging the phone to 100% and then running a 90-minute full HD video at maximum brightness with various apps syncing wirelessly in the background, and seeing how much the battery dropped. However, after a few more days the Galaxy S7 Edge started to show the telltale signs of poor battery management once again, dropping a few percent here and there rapidly when running multiple apps – noticeably faster than something like the Huawei Mate 8, which is an absolute tank when it comes to battery retention, thanks to a militant attitude to app use when the phone has gone to sleep. Its battery basically felt a little less 'slippy' compared to previous years, where we've noted that just having the phone in our pocket would cause the battery to drain for no reason. However, it's good to see that the S7 Edge makes a real step forward here. We appreciate that the balance is hard to achieve: giving you the information you want when you need it, but knowing when the battery could be saved at less critical times. This is partly to do with upgrades to the Exynos chip, but also thanks to the upgrades that Google has brought to the table with Android Marshmallow – the new Doze mode is more efficient at making sure your phone isn't constantly waking up and checking the network to see if there's any more information to feed you. ![]() The Galaxy S7 Edge lost 10% battery overnight, which is a little high, but we did have the always-on display enabled though – a repeat test with it turned off (and do not disturb mode enabled) saw the battery drop just 2%, demonstrating that the S7 Edge is pretty good at not drawing too much power when it's asleep.
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