Guilty as charged: Apple confesses some Smart Battery Cases are having 'issues', offers replacements
https://www.theregister.co.uk/2020/01/13/apple_launches_battery_case_replacement_program_over_charging_issues/
Apple has announced yet another replacement programme — this time for several models of its pricey Smart Battery cases.
According to a post on Apple's website, some cases will fail to charge when connected to the mains — or will charge intermittently. The flaw also prevents the battery case from discharging juice to the phone, which is pretty much the entire point of them.