Get a Battery Tender, like the actual brand and one that charges AND also maintains that doesn't overcharge it while being plugged in for an extended period of time.
Depending on how depleted the battery is, the tender may be able to revive it. Also look at the battery condition. If it looks bloated, time for a new battery. For context, my Z is barely driven (I've put 12K miles over the past 7 years) and my battery is 5 years old. There was a time when my car didn't start due to the battery just sitting there, and bought a battery tender and was able to revive it. I leave the tender plugged in at all times.
In regards to a grounded location, I plug my tender to one of the bolts of the strut bar. It can be on the negative terminal post of the battery itself or any grounded metal point.
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