Ecoflow’s Rapid Pro power bank is one of the most powerful portable batteries we’ve tested, and it’s selling at an all-time low price of $149.99 ($70 off) at Amazon and from Ecoflow’s store during Black Friday. The 27,650mAh battery pack has three USB-C ports (one 140W port, plus two 65W ports), a two-foot-long retractable 140W USB-C cable — enough to charge four devices at once — and it has a maximum power output of a whopping 300W. And, yes, you’re allowed to bring this model on a plane, since it falls just below the FAA’s 100Wh limit for carry-on bags.

EcoFlow Rapid Pro Power Bank

Where to Buy: • $219.99 $149.99 at Amazon • $219.99 $149.99 at EcoFlow

That speed allows you to charge a pair of 16-inch MacBook Pros from zero to 50 percent in about half an hour, with enough juice lef

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