For the past month the electrical gremlins came back to plague my 2002 XKR. Windows losing their memory. Doors locking and unlocking with no user input, etc etc.

I checked my records and it’s been right at 8 years since I purchased a battery, right after the car came to reside in my garage. And it’s been flawless up to recently. Does that sound right for a NAPA AGM battery ? I was hoping to get 10 years out of it. Was that unrealistic ?

Did Keeping the battery on my NOCO Genius 5 tender have any impact on the battery life ?

My new battery got installed yesterday. So far it’s banished the gremlins……

Z

 

Eight years is more than a lifetime for a battery in these cars. You certainly got your money's worth....

 

I'd say anything over 5years is bonus- even if kept on a tender

 

Mine is just over 7 years old and I occasionally hook up the CTEK if not using for a few days. I do get random warning messages every so often or the transmission goes into full automatic mode (cannot manually change gears) but these go away the next time I start the car. My workaround has been to turn the key to the first position and wait a few seconds for the self-checks to complete before starting, but the next time I bring the car to the local guy for servicing I will probably have him change the battery.

 

Just buy the cheapest battery you can find ..forget warrantee. Keepit 4 years and get a new one

 

I doubt they expect their customers to hold on to their cars this long.

First OEM battery lasted 13 years

This replacement still going strong at 10 years with a lifetime replacement guarantee. The battery gets disconnected for 6 months over winter and still is "good as fully charged" come spring, no battery tender needed.

 

Wow, that's good!