Originally Posted by Rambos_Ride
Dead as in... did you test at the battery terminals with a voltmeter or dead as in no lights no crank?
Deep cycle? Lead acid or AGM?
Side post connections have to be the worse design ever for maintaining good connections...freaking 2019 you think they could do better.
Iíve had batteries drain completely and never take a charge again.
Bought in 12/18? Take them out and have the place you bought them from load test and/or just warranty them out for new ones.
Yes, tested at the terminals both dead. The are lead acid interstate batteries from Costco. I guess I'll have them load tested. Just seems really strange for them to both go bad in such a short period of time.