iFixit just can’t help themselves—while “repairability” isn’t much of a factor when buying an iPhone case, the fix-anything gurus still tore down Apple’s new Smart Battery Case for the iPhone 6 and 6s. They found a big battery, of course, but fewer smarts than you might have guessed.

Apple’s $99 case holds a 7.13 watt-hour battery, that’s 1877 milliamp hours at 3.8 volts. That’s a big battery, more than the iPhone 6s’s built-in 6.55 watt-hour battery, so you should get more than twice the battery life with this case attached.

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