The hidden metric that makes these portable power stations truly worth your money ...

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Power outages can be inconvenient, especially as the dark and cold winter months arrive. If you live in an area where a power cut is far too common, having a backup power source can be a lifesaver.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Unsure what size power station is right for you? Start by figuring out the maximum output you need. It’s ...