In early December Patently Apple posted a report titled "Did one of Apple's latest Patents just reveal Apple's Next-Gen Smart Case with Inductive Charging?" Today Apple has released new Smart Battery Cases for iPhone XS Max, XS and XR for US$129.
Apple notes that the "Smart Battery Case is compatible with Qi-certified chargers. You can charge your iPhone and battery case simultaneously for increased talk time up to 33 hours, Internet use up to 21 hours, and even longer audio and video playback.
The case can be charged even faster with USB-PD compatible chargers. It also supports Lightning accessories, such as the EarPods with Lightning Connector (included with your iPhone), or the Lightning Digital AV Adapter (sold separately).