Testing Batteries

Hi all, I am looking for the most efficient way to diagnose and evaluate battery life. In the past we have discharged the cart and tested batteries with volt meter. I sometimes use a hydrometer as well. I have 80 carts and this is very time consuming!

Does anyone have experience with the cadex battery tester? Will it tell me what i need to know? Are there any other options to test batteries??

We have 48volt ezgo rxv's.

Thank you for any input!