Join Date: Aug 2009
Location: Washington, the state
Let's say that it takes maybe 15% of your battery's capacity to start the engine. And the battery ages and loses 20% of its capacity each year. After the first year your battery is down to 80% at best, but no problem. Third year, 40% capacity but it only takes 15% to start, still no problem. Fourth year, 20% available; 4-1/2 years it gets dicey...and one day your battery dies "suddenly."
Your numbers might be different, but the process is the same.
Yes, there might be a charging problem. Do check the charging voltages on the three phases from the alternator and pull the cover to check that the magnets are tightly glued and in evenly spaced positions.
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January 6, 1941