I don't think you said how old your car/battery was, but mine is a 2020, so 4 years on the original battery. We bought it December 2022 and my battery started doing this power save thing the day I purchased it. At first I didn't bother because it always started without any hesitation. The only other thing I noticed was the Auto Start/Stop would never activate. Eventually, I found the screen that said this was due to battery charging. So I began to use a tender whenever the car was in the garage. After several weeks of charging at home, the AS/S finally started working. Point I wanted to make is that it may take quite a number of days on the charger before your battery will achieve a "full" charge and stop giving you the power save messages. You might also consider getting a Topdon BT100 battery tester to load test your battery at home. I discovered that mine originally was showing only 60-70% capacity left, but has improved with the constant trickle charging. It went from marginal (Yellow) state to good (Green) state once on the charger regularly.