Re: battery lasted 9 years
I had to finally replace the two "Duralast" batteries I've had in my '82 GMC diesel pickup--they were take outs bought at a salvage yard ,one was made in 2001,the other in 2002,that one was a "Gold" version,the other just a plain Duralast...
I bought the truck in 2003 with those batteries in it!...despite it sitting idle a lot ,using the truck mostly for plowing and dump runs only,and having other vehicles to drive,they still somehow managed to get the diesel fired up--I only had to recharge them a few times in winter when I ran them down trying to start it on frigid mornings--they were not even the correct size ,they were fairly small group 74 size and the truck is supposed to have group 78's...
When they started dying quick when it was cold out last winter,I load tested both of them,the "gold" series one has a bad cell,it drops to 5V as soon as a load was applied..the other one still seems good,it'll maintain 12V for at least 10 seconds with the carbon pile tester glowing brightly..
I bought a group 78 Interstate at a flea market for $10 one day last fall,when I forgot to shut off the parking lights on my truck and both batteries were stone dead 4 hours later--I figured the battery may have been no good,but the guy insisted it was,I was only willing to pay $10 in case it turned out to be junk,I could scrap it for that..
But it started my truck right up,and is still in it today..I found another group 74 that was a year old,a friend was going to scrap the car it was in so he gave it to me..so far both are working well..
I have had a few other batteries last a long time--the original "Mopar" battery in my parents 1993 Caravan lasted until 2005,and a red top Duralast I had in a '79 C10 with a straight six lasted the entire 6 years I had it and was still going strong last time I saw the new owner of it 2 years later--paid $20 for it at a junkyard ,it was only about 9 months old..
Seems batteries today are triple the cost and you are lucky to get 1/3 the life out of them that you used to be able too..not many come with a good warranty either--some are only guaranteed 90 days !..