Another Battery Question

I have a 2008 CC Prescedent. Batteries are from 2011 (NAPA) I also have a ScottyB Digital meter. Batteries are always plugged in or on a Sav-a-battery maintainer. Today when i started to use the cart i had very little power. Meter registered 26 volts. Checked all connections ,tight. All batteries measured around 8.2/8.4 volts . one was at 7.8. After recharging can I attach my volt meter to the low battery and check the draw on that one battery over the others?
Thanks in advance.
If you had a choice US Battery or Crown?