Chosen Solution
My clock is not keeping time when the laptop is off or in standby. I suspect a failing PROM battery. How do you replace a PROM battery in a 2015 13’“ MacBook Pro?
There is no backup battery as Apple dropped it once they went to a sealed system. An iMac still uses a PRAM/NVRAM coin cell battery. Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question I’m suspecting the one and only battery your system has is failing or defective as it has a trickle feed for the NVRAM logic so its settings aren’t lost.
