Since charging issues have been found in some iPhone, Apple has started a new replacement program for its iPhone XS, XS Max, and XR Smart Battery cases. Some of the cases may have an issue, according to the company where they won’t charge when plugged into power or they might fail to charge your iPhone. If your model is affected, then it will be replaced for free by Apple or one of its authorised service providers.
The battery cases are not cheap at $129, but their tight integration with the iPhone indicates they come with a few benefits. For example, iOS will display the charging level of your battery case in its top notification bar and may also pass data through the Lightning port of the battery case.
If your case is suitable for a repair, it may be worth taking it to an Apple Store regardless of whether it has issues. You are going to get a newer model, and in the future, there should be less risk of it having problems.
According to Apple, the affected models were produced between January and October 2019 (case announcements were made in January). If you want to take advantage of the program, then Apple says that you will need to take it to an authorised service provider or an Apple store, where it will be checked to ensure that it is compliant.
If so, then Apple says it will environmentally friendlily disposal of your old model. According to Apple, affected cases will be compensated for two years of their original sale.