Some time back after I got new tires for the wife's ol Lexus RX 330 on the way home I bought a AGM battery for it. I think it was about $200 then.
She doesn't work and we generally use my SUV so the Lexus sits a week, two, three weeks, sometime about a month. When we go out to start it, it turns over like normal and fires right up every time. It's get so little use but the battery turns it over like a daily driver. Then when she does drive it, its short in town trips.
When I do the annual oil change, it always comes out like new from the jug because so little use - might go to 2-year oil changes and at that it still would have very little use.
Come to think about it, the Lexus has sat for about a month or so - guess I'll go out this afternoon, check the fluids, tires pressures, wiper's etc. and maybe fire it up. Maybe run it with the OBD II plugged in and watch it.