With winter approaching and the possibility of getting snowed in, there's a certain comfort that comes from knowing your phone can stay active throughout a week-long power outage. Being able to place calls and derp around online (assuming the towers are still active) is like a super power.

But you aren't born with that innate gift. First you have to buy an external battery pack to replenish your phone's reserves when that icon in the corner goes empty, and preferably a big one.

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