Carquest Gold Deep Cycle Marine Battery, $85 each, just replaced 2 on my trolling motor and the last set of same lasted over 5 years and still had decent life left but was not sure they would handle my 12-16 hour days on the water that I do in the spring and summer so changed them out. I get just as much out of this set as the last set. As long as they are around I will buy these. Unless you can get 10 years out of the Optima then my deal is the better deal and I save about $60 to boot.