Anybody running CAT maintenance free batteries?

I'm running a 97 KW t-600 with 3 of these batteries rated at 1000 CCA. I was checking my notepad that I keep track of everything I do to my truck and these batteries have been in my truck since Dec of 2008 with approx 122,000 miles on them. This is a farm truck and only gets 15-20,000 miles a year on it. Only electronics I'm running in the cab is a two-way radio and a electric tarp on my hopper. Not much running at night.

I did not believe that these battery's are this old and must of messed up my notes so I pulled battery cover and they are stamped back in 08.

Did I get lucky to make it this far with a set of batteries or is this normal? I kind of thought 5 years was tops on them anymore but I'm not running a lot of power in the cab. I'm up north too with a cooler climate so maybe that helps with the life of them. Just kind of curious. I guess when these do fail me I'll be putting the same back in. Thanks

 

Also forgot to add that they are still in the truck and running strong.

 

Every year I open up the battery box and clean connections if they need it and keep them clean looking, which I think helps the life of them. I do not ever see any leakage from the plugs on top of them.

I am very pleased with them.

 

I just phoned my local CAT house here where I buy from and they are currently on sale till Dec 3 for 99.00 each. Normally are 135.00.

I will be buying another set for sure before sale ends.

Part no on those batteries are 175-4390