Apple’s MagSafe battery pack is the second smallest battery pack ZDNET has tested, despite how bulky it may look in photos. It’s equipped with two battery cells, each with 11.13Wh capacity, but still, you shouldn’t expect the battery pack to charge your iPhone from 0 to 100. Wireless charging isn’t the most efficient because of several factors (heat being one of them). You’re more likely to get around a 60% charge on the iPhone 12 Pro, and for most, that’s enough to get through a long day at work or travel.