There are a ton of cheap batteries out there to choose from, so when we do reviews for them here at Android Police, we tend to be pretty picky. USB-C is a must-have from our mobile-first perspective, and anything less than 30W of output is a bit of a snooze. Thankfully, 45W seems to be the new high-end standard going into 2019, and RAVPower's new 20,100mAh battery ostensibly delivers that now-essential level of power for a mere $60. That's $140 less than what Mophie is charging for its similarly-spec'd 26,000mah battery, and Android Police readers can even get an extra $9 off via our exclusive coupon.

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