I just replaced the OEM battery in my Nissan Frontier with a Dynacell. I had one put in my wife's Saturn about 5 years ago when the AC Delco had an internal short. The Dynacell comes with a 6 year 100% replacement warranty and uses a gel technology. I have been very pleased with the one in my wife's car and hope the new one does as well. I have attached a link to the Dynacell Web site. Apparently, these are only sold through car dealerships, ast least as far as I can tell.
http://www.dynacellbatteries.com/
http://www.dynacellbatteries.com/