I don’t have personal experience, but from the Optima website FAQ: Note: The difference between BLUETOP® and YELLOWTOP® deep-cycle batteries is that BLUETOP® batteries have both automotive (SAE) posts and threaded studs, while YELLOWTOP®S (other than D31T) only have SAE terminals.
If you ever get confused on the colored tops, just remember: if it has a dark gray case, then it’s a starting battery; if it has a light gray case, then it’s a deep-cycle (dual-purpose) battery. From: Paul McCall Sent: Thursday, June 11, 2015 9:22 AM To: [email protected] Subject: [AFMUG] optima battery preference for battery boxes Blue Top or Yellow Top? Paul McCall, Pres. PDMNet / Florida Broadband 658 Old Dixie Highway Vero Beach, FL 32962 772-564-6800 office 772-473-0352 cell www.pdmnet.com [email protected]
