Year old battery good for one start only

Ok good, Keep us updated...

I'm always hesitant to do the follow up post, but I read so many of them that rejoice in their success of fixing the issue, then a day or two later come back to report that the problem persists.

I'm cautiously optimistic that the battery was the problem. I bought a new battery on Monday. It has been in the 30s every night since, and the truck has fired right up every morning. Still don't know why AZ's load tester said the old battery checked out fine (it still has 12.4 v sitting on my garage floor), but I'm fairly convinced the guy didn't know how to either use or read the tester.

Once again, thanks to everyone that helped with this!

Forget anything AutoZone or Advance Auto "team members" tell you. Never met one with a clue.

The new style of testing doesn't put an actual load on the battery. It fires ac voltage into it and compares the resulting waveform to stored information on how it should appear along with measuring the internal resistance. I've had new batteries fail the first test and pass on a second test. Anytime I have one fail I always retest after moving the clamps on the tester.

All wet cell batteries will sulfate during operation. If the sulfate isn't broken down and recombined with the electrolyte during recharging, it will harden and reduce the active plate size with a resulting loss of cold cranking amps / cranking amps. Basically the large battery is being turned into a small battery about the same size used on motorcycles. There isn't enough amps available to start a large motor but it still reads 12.6 volts fully charged.

I swear you learn something new every day, good info stamp.

We need more olden & hardened members like stamp here... full of knowledge and experience us young folks feed off of!

I especially like the part of the battery being reduced to a motorcycle sized one. It's rare when I get Oreillys or Sears or whom ever I bought from, to say it's bad let's replace it. I have to demand them to. I remind them that I was a Manager for them as well as a mechanic. Like Stamp said, modern testers don't have the pile testing of older or better battery load testers. It's done that way, so retailers sell more batteries, even though their under warranty. It stinks, but that's life in the big city.

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