The second-gen AirPods Pro did not look much different from the first on their reveal; however, Apple asserted that they come with an estimated 6-hour boost to their battery life. Then again, the company also neglected to list the exact specs associated with those claims, as it so often does.
The Chinese regulator 3C has dispelled this mystery, however, by listing the AirPods Pro 2 and their MagSafe-compatible case in the course of approving them for sale in their jurisdiction. According to the group, each earbud has an on-board battery of 49.7mAh.
The first-gen Pro earbuds, on the other hand, have been found to have 87% of that rated capacity at 43.24mAh. Their successor's case, on the other hand, has a 523mAh battery: not much different from that of its predecessor.
Nevertheless, it remains among the largest new Apple wearable in terms of capacity, alongside the new Watch Ultra at ~542mAh. The Ultra, however, is the only one of the 2 with a metallic housing for said battery, as iFixit discovered while tearing the device down (along with the potential durability of its new screen type).