Multimeter Accuracy

[MWS]

Is there a definitive way to check accuracy of a multimeter? For example, my car battery is showing 13.26v and I checked a AA (1.5v) and showed 1.72v. I am asking because I recently exchanged an old (very dead battery) that I showed at only 1.87v, and the store tested at 4.32v. I borrowed two meters from my neighbor to check the battery that I read at 13.26v, and the other 2 meters showed 12.87v and 12.14v. Just to clarify, the battery in question was under no load and disconnected. Also, on additional readings, each meter showed approximately the same as previous reading (+/- .02v).

I know I may just be picky, but numbers mean things, especially if the reading is showing to 2 decimal points.

Thanks in advance!