I searched the forum and didn't find anything about my question.

I am considering a HS250. One issue I will have is that the vehicle will be stored in my garage for 4-5 continuous months each year - not driven, not started. What will be the impact, if any, on the battery pack?

I will have a float charger on the 12V battery.

 

no problem. As long as you keep the regular 12V charged up, or charge it when you return and plan to start it, you will have no problem starting the car. Obviously, the battery pack will be weak, if not drained, but the engine will just start like a normal car and it probably will not run on electric mode until driven for some time. The 12V is used for the starter and driving the car should restore the power in the battery packs

 

I too am storing mine for 5 months this time.Vendor/service has recommended disconnecting the battery(it's tricky!not like you may be used to)and I also store mine on 4 jacks to make sure that steel-belted tires do not acquire a "shape"while sitting in the very same position all that time.
I believe these are very helpful instructions worth following.
macko1944
Vancouver,BC