From October 2006 Consumer Reports testing ....
All of these batteries will start and run the vehicles they fit. Our Ratings emphasize life-test results over reserve capacity and cold-cranking performance; you?re likely to find the trade-off worth it.
Some battery compromises are a function of design. For example, specialized North and South batteries emphasize cold starts or heat resistance and are sold only in those regions. While several regional batteries did well, so did many nationwide models.
CR rates auto batteries by overall performance within group sizes and footnotes models that are sealed and maintenance-free, a plus if your vehicle?s battery is hard to reach. See Select the right size battery for your car to choose the right group size for your vehicle. Then see Quick Picks (below) which focuses on specific needs and value. Group size is indicated in parentheses.
Quick Picks Best for cold climates: EverStart $60 (65) AC Delco $90 (65) NAPA $70 (65) AC Delco $90 (75) EverStart $60 (75), CR Best Buy Interstate $90 (24/24F) EverStart $45 (24/24F), CR Best Buy EverStart $60 (34/78), CR Best Buy Nascar $100 (34/78) NAPA $60 (35)
Batteries from EverStart, Kirkland, and NAPA are good values. If you live in a warmer climate: NAPA $80 (65) Duralast $60 (65), CR Best Buy AC Delco $90 (65) NAPA $70 (75) Nascar $40 (75), CR Best Buy AC Delco $90 (34/78) Duralast $60 (35), CR Best Buy
All of these scored relatively well in life and reserve capacity and are either national or Southern regional batteries.