By contrast, the iPhone 13 Mini will happily make it through an entire day – even with heavy usage. This improvement in battery life was achieved by Apple using a 10% larger battery inside the iPhone 13 Mini. The iPhone 12 mini used a 2227mAh battery, while the 13 Mini uses a 2406mAh battery. And while 10% doesn’t sound like a lot, the There are a few other exciting changes, so read on! iPhone 13 Mini vs iPhone 12 Mini in a nutshell: Longer battery life! 13 mini lasts 1.5 hours more than 12 mini. Nearly identical design and styling, newer phone is a bit thicker and heavier. Same 5.4" screen size, 60Hz on both, but newer phone gets brighter. .