My wife's MDX recently started throwing a bunch of warnings right at startup -- SH AWD, Emission System, O2 sensors, and some other codes. I find it highly unlikely that all those systems would be having issues at the same time and after reading on here, I decided to replace the battery. The old battery was installed in Oct 2014 at the dealer and was an Acura battery rated at 630 CC amps. I read online that most flooded cell car batteries tend to go bad after around 5-6 years. I live in a mild climate and the vehicle is garaged every night. I tested the old battery with a battery tester after removing it from the car and it had 530 amps. The new battery had 805 amps (rated 700 CC amps), measured in a ~55 degree F garage. Anyhow, I'm curious, has anyone actually had an Acura battery last 100 months with regular use? I suspect that they just want to get people bring their cars into the dealer for replacement to boost their service revenue. I can get a $15 core deposit by bringing the battery back to Costco. If I take it to the Acura dealership, will they give me anything for the warranty? I suspect not. Curious why they give such a long warranty.