Hi,
I have problems with GC draining my iPhone 12 mini battery massively when in use. When syncing and BT on, it drains at least 1% per minute actively in use. In 10 minutes with device connected that would be 10% drain, sometimes more. What a mess. It has been with several iPhone devices, I exchanged the Mini several times because of display issues. A complete iPhone reset doesn't change anything, I never install from backups. It happens esp when a device is connected via BT and synced. And it only happens for maybe a month or two. So it has do something with the latest GC update/s. It hasn't been the case with GC and my 12 Mini in the beginning, maybe 3 months ago. Started around January. And again with any device and any iPhone, even when newly restored. Something in GC which was updated drains the battery massively. I mean 1 minute = 1% battery drain is massive, even for 12 Mini. Don't let me get started on my original iPhone SE, there it is around 4-5% per minute because the battery and device isn't the latest and greatest.
Garmin please fix this battery drain with latest updates and iOS 14.3 and 14.4