The nightly recharge is a fact of life with most modern smartphones, and the HTC One is no different, but what if you could double your runtime and protect your expensive new toy in the process? That's what Mophie promises from the Juice Pack for the HTC One, a combination external battery and hard case that, when wrapped around your phone, should let even the most ambitious power-user escape the tyranny of the charger. All that flexibility comes at a price, however: $99.95 and a considerably larger device in your pocket. Is the Mophie Juice Pack worth the compromise? Read on for our full review.