When I had my back op I couldn’t ride for a year. I used to regularly start up my SP2 thinking I was doing it good, as well as raising my spirits.Why not start the bikes up regularly and warm them through - do much more good than just keeping the battery topped up.
When I eventually could ride again the clutch plates had rusted together, you wouldn’t believe the moisture inside the casings.
I’ve never used that method since, put on optimate and leave it alone.