The last thing anyone wants at the end of a long day is to look down at their phone and see its battery almost dead. One way to avoid that is to keep a compact power bank on you at all times, and it’s arguably easiest to do that with one like Anker’s 621 MagGo portable battery. This sleek, 5K magnetic brick attaches to the back of your iPhone to power it up, even while you’re still using it. Now, it’s on sale for 30 percent off —
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