While you might get all-day battery life with a 13" MacBook Air, other Apple laptops don't share the same luxury—especially if you're a power user. Because of Apple's proprietary MagSafe charger, only one company—Hyper—offers an external battery that can actually keep you powered on the go. Although expensive, their latest batteries provide a level of versatility that warrants the cost if you're always in need of a little extra power.
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