What years/miles have you guys had to change at? I have an 03 with 110000 miles and still original but I realize by posting this I may have jinxed myself!

 

it all depends on where you live

here in the midwest I believe the average battery life is 36-48 months

call your local battery store and ask them.

also keep in mind that its possible one of your batteries is bad allready so your alternator is working overtime to keep the one battery charged and try to charge the dead battery which will burn out the 400-500 dollar alternator in no time.

 

My 03 batteries died just within 36 months and took the alternator with it.

 

My 04 has 76,000 miles and is almost 4 years old. The batteries are still going strong but I'll replace them before next winter.

 

Just had one replaced under 3/36 warranty on my '05 with 35k.

 

I just replaced the factory Motorcrafts with 72K on the truck. I put Duralast Gold Tops in it.

 

I have an '03 that had 121k miles a month ago when I replaced the original Motorcrafts with Interstates.

 

My 03 has 128,000 on it and I just changed the original Motorcraft batteries with Kirkland's from Costco.

Greg