Reply to Seeking your advice………………….

Sony: “The internal battery discharges gradually if the camera is only used for short periods of time. If the camera is not used at all for approximately 3 months, the internal battery becomes completely discharged.”

And like for any older battery that time window shrinks over time. So I don’t care if I have to set date and time again (amongst other considerations). Since the clocks of my various cameras deviating quite fast from the real time I see it anyway necessary to adjust settings more often than I like. I give no thought to internal batteries, but talking about storing a camera I would suggest to take a battery out. If I have the batteries in one place I might be less lazy to feed them here and there some fresh power.