Dicharge test on a 72v pack of group 31 Gel batteries

Recenly installed 6 12v Ultra Power Gel group 31 batteries in a 2009 GEM. Can anyone tell us how many minutes on a Lester 72v discharger you should get out of a new pack of 6 12v group 31 gel batteries? Thank you.

you need 15-20 charge on new batteries before they get full power

51 MIN @ 75A for a good battery with Lester

Thanks for the info. The batteries do have 15-20 cycles already and only achieve 30 minutes @ 75A to the 63V level. Looks like I am sending the batteries back. Thanks again.