Are you sure you're using the same settings?
I didn't change any settings regarding the Traccar Client. But I had been running the client as "not optimised" (battery wise) - which I set many months ago to get a good result. But I've now changed the app on Android to "Optimised" - I'll run that for a bit and see. This is on a Pixel 6 Pro.
I know moving to Android 13 affects many things but my battery usage for Traccar shows as much higher now with 13 and noticeably affects time between charges. Does anyone else see this?