« Reply #20 on: April 21, 2016, 05:56:11 PM »
I know this is an older thread but i wanted to inform you of why this happened. You can have weak cells in a battery that test fine under no load. Then when they get under load (starting the engine) they fall flat on their face and cant turn the motor over. As I was reading through this i knew exactly what your problem was. Testing a battery with a multi meter will not give you a true test of the batteries health. You need to test it with a load tester (its basically an 12v electric heater wire that runs the battery power through it to heat the wire and put a load on it) otherwise you will never really know.
I'm glad you replied, as I am in charge of UPS (battery backups for computers) repair/replacement at work, and I routinely run into these batteries that test fine on a multi, but do not pass a self test that runs once a week. Even the expensive load tester at a local battery shop doesn't catch most of the defective batteries that I bring them.

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