just thinking of dis-connecting the battery and bringing it indoors and maybe once a month i'd fire it up and let it idle up to temp?
Good plan ... The OEM spec "Gel" battery is VERY fragile when its discharged or been left a while (and they self-discharge at about 2% per day so in about 30 days it stands a good chance of being shagged). Modern AGM batteries are a lot better but you should still charge them every 2 weeks or so.
The worst thing you can do to a battery (besides dropping it or setting it on fire!) is to let it discharge to 10 percent capacity and then say "Right- now let's have 100 amps to crank my cold engine with dead fuel in its carbs".
Expect "Sudden Battery Death Syndrome" if you do that.
And ... If you haven't got an optimate or similar, make sure the 'on-charge' battery voltage doesn't go above 13.5V