Everyone needs a batter tester like this one:
MOTOPOWER MP0515A 12V Car Battery Charge Tester and Alternator Analyzer
Oh look. A new gadget! Might hafta open the Amazon app. ?
Just test the battery every couple of months and there will be no surprises. These work great and you can get them on Amazon for about $35. It uses an algorithm that estimates remaining battery life based on cold cranking amp.
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