iFixit has posted its teardown of Apple’s iPad mini 4. The biggest internal change from a user standpoint is the smaller battery when compared to the iPad mini 3 — Apple’s newest mini has a thinner 19.32 Whr, 5124 mAh single cell battery, as opposed to the prior generation’s double cell 24.3 Whr, 6471 mAh battery. We’ll see if there are any major differences during battery testing in our upcoming review. The teardown points…