I had the same think happen when my Delco sealed battery was 5 years old. Dealers use a battery conductivity tester, which some on YT hate and think they don't work. In my situation the dealer said my old battery had a full charge but failed the load test.
Exact causes why an old battery to fail the load test is anyone's guess. I've came up with my theories. Then I catch heck for publishing my results here. Some don't want to hear why batteries fail and why some test equipment give false readings.
Bottom line, dealer may want to sell you something and make money. My GM dealer wanted $165 to replace my battery with another Delco sealed AGM battery. I went to Rural King and bought an excide battery on sale for $45. I bought two batteries and put one in car too. The delco in car was 7 years old.
5+ years later I removed both excides from car and truck and installed them in dump trailer. Rural King had a sale on Excides again. I plan to travel and wanted a new battery in car. Didn't want to get stranded in truck either.
So bottom line, sooner or later all batteries will fail. Why not replace them sooner when you find one on sale and use old battery in a tractor or dump trailer?
BTW, I could write a book on how many times GM and Buick dealer wanted to rip me or my friend off. I use dealer to service vehicles. But buyer be aware they need to make money too. Last attempt to rip off my friend was to tell her you need to replace right tie rod end. Even wrote it up. $230. Nothing wrong with tie rod end. Even went to another place and got a second opinion.
Good luck. Find someone with a good load tester than can measure the full cca of battery and see if battery passes or simply replace it before you are left along side road. geo
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