Massive power: Best of the biggest power banks and portable battery packs

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Remember walkmans? They sparked quite a revolution back in the day by letting us listen to our super awesome megamix tapes even while on the go. Most walkman models ran on a couple of AA batteries which could be easily replaced when exhausted.

Smartphone batteries, however, are a bit different from garden variety AA cells. They have to be recharged regularly, and there's not always a power outlet nearby. The solution? Get a power bank! These portable battery packs are extremely convenient as they provide emergency power when we need it. And while they come in a broad ...

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