Considering that your phone also functions as your GPS, calendar wallet and much more, getting caught with a dead battery can throw a serious wrench in your day. Fortunately, there are portable battery packs that are designed to prevent that, and if you’re an iPhone user, right now you can pick one up for less. Amazon, Best Buy and Walmart are currently offering $28 off Apple’s MagSafe battery pack, dropping the price down to just $71.
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