While two dozen battery cases have been released for the iPhone 6, only a handful have become available for the larger iPhone 6 Plus, which can run longer without assistance. But there are definitely situations where even the iPhone 6 Plus can benefit from extra battery life, including international travel and occasional emergencies. And that’s why Tylt has released the Energi Sliding Power Case for iPhone 6 Plus ($100). It’s a true rarity due to its Made for iPhone certification, some unique features, and much better performance for the same price as Mophie’s Juice Pack for iPhone 6 Plus.

In what may well be a first for iPhone battery cases, Energi is actually being offered in two different widths, one billed as “2.9-inch” and the other as “3.3-inch.” They’re both sold for the same $100 price, but the 2.9-inch version has a 3,200mAh battery and the 3.3-inch model has a 3,500mAh battery. Another surprise: the model I tested with the 3,500mAh battery unusually boasts 2.1-Amp power output, which means the iPhone 6 Plus will recharge at its top possible speed. There’s more, too…

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