2005Redfire6

Wasn't it her that had the UDP's and it wasn't charging right? Or was that someone else?

Nuke

Must have been someone else since her Pony doesn't have UDP's.

What I found back in the Chicago burbs was, when she was making multiple starts with stop n go traffic and runs of less than 1 mile day-in and day-out, the alternator wasn't able to maintain the battery above about 50% charge (that was in '09) and I was putting a battery tender on it every so often. But since she's driving longer distances with more steady state speeds here in Mississippi, the battery seems to be maintaining itself above 75% charge without any outside help. I'll probably have her battery load tested before the heat of the summer hits. I figure that we're both on borrowed time.

GlassVapor

06 LL still strong at 14k (knock on wood or something similiar)

NoChrome06

Mines straight and mines an 06, I sit at lunch everyday and watch movies on my doubled din screen deck and she's a sure fire every time. Things a beast! Haha

tx_zstang

Mine died in my '05 after only 3-1/2 years. Leaving the Shaker on and letting the car sit for a week finally killed it. Had to jump it once about a month before then, too.

pascal

For us in FL, 3 years is about it as far as longevity.
Mine was gone in a little less than that.
The record I've seen is 9 years (Duralast).

MustangFirstCar

I have an early 06. The battery died last may, but was replaced with a battery out of another 06 that works fine.

JCON

I still have my original battery in my 05. I believe it was built in January of 05 as well, never had an issue with it. Car has 49,xxx miles

mustang country

I bought my '07 V6 Mustang in December of 2006. I had it replaced in late of '09. Lucky for me that battery died in my driveway because that day, I drove all the way to Ft. Lauderdale and back to Miami.

hataap

I got my stang in April of 06 and still have the original battery.