Put the multimeter away, be like Nike - Just Do It. Assuming you have a battery charger handy.
Nah, I don't bother. I drive it daily and no reason it shouldn't be charged other than being old. It was almost 6 years old and was measuring 12.2 so I replaced it. I won't get to drive it much until Monday, but thanks for the tip! I would have never thought about the battery for this code and a stabilitrak message.