[911pcars]

A storage battery will slowly self-discharge. If not recharged, it will eventually not be able to fully or partially recover. Thus, the better option is to remove it and leave connected to a battery maintainer.

However, a non-op car will deteriorate without occasionally running it. Bring the charged battery back and concoct a quick in/out connect method to run the car without officially reinstalling it.

Don't go overboard, battery post quick-connect switches can be sourced at Harbor Freight for a few bucks. Install them on both positive and negative cables. You will also need 2 extension cables with appropriate connectors at each end.

Sherwood

Correction: only one of the above switches are necessary. Install on ground side. I got carried away. A second switch just adds to any voltage drop (not desired).