I bought a boat in Nebraska last fall. It is a 98 model,it had a blue top for the cranking battery.It went south in January and after looking at it would have been 8 years old in March. The boat hadn't been used very much but for it to last that long speaks for its self,and I replaced it w/ another blue top.It had 27 series Ac/Delco for trolling motor. Replaced those w/ 29 series Ac/Delcos which are maint.free. Have had real good luck w/ these over the years at $110.00 a piece tax & title out the door.