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There's a wide world of smartphones out there, but they all have one thing in common: they always run out of battery power at the worst possible time. This is why USB battery backups are so useful, letting you top up whether you're out playing Pokemon Go or on a cross-country flight with no outlets.
Even if you've got one already, the current deal on the RAVPower 20,100mAh USB battery backup ($55.99 at Amazon.com with coupon code KS5JPQE4) is too good to pass up. For $75 off the list price (with the coupon code entered at checkout) you get a battery backup that can easily keep an iPhone topped up for a full week.
Though there are cheaper battery backups out there, this one comes with QuickCharge 3.0 compatibility and every type of USB connection you'd need, including Type-C. According to RAVPower, that allows you to charge your phone, the power bank, and even some laptops like the Apple MacBook, all faster than you can with older backups.
The best part of this deal? It even includes its own QC 3.0 wall charger, so you don't have to buy a spare. Given that it costs $5 less than than the same pack without a charger, you're saving some real scratch here.