I guess it's worth adding that leaving the car plugged in for 4 months at a high state of charge like 100% or 90% is worse for battery health, hence the 60% recommendation.
Also, if your garage floor is concrete, put some rubber mats or vinyl floor tiles under your tires. Parking on concrete for that long will leave hard spots on your tires.
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If you are going to be gone that long set the charge limit to 60% and leave it plugged in.