Devbot
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I just tested the battery with a multimeter: 12.29 volts so still going strong.
You need to do what's called a load test to determine battery health. Testers can be bought for pretty cheap and autozone/napa/etc might offer it for free. Be careful with them cause they get hot, they're basically a giant fuse with a meter on it. Oversimplified; they basically hook up to your battery and put a major impedance across it, and how the batt reacts will tell you about it's lifespan. Takes no more than 60 seconds all said and done.
Just prodding with a multimeter won't tell you much - when dead cells occur more often than not resting voltage will check out perfectly fine in nearly every situation but cold cranking, when it's experiencing the most load.
They look like this.
To me it sounds like a dead cell; in my experience starters are almost always either will-start or no-start, and you only start hitting that "maybe it will start maybe not" window after they've been dying for a while and you've hit them with a hammer 5 or 6 dozen times. But that's just my opinion.
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