Quote:
Originally Posted by bronsin
Geez how do you know it boiled?
Only one cell was low actually. It took just a few oz of water.
I drive the car every day about 6 miles to and from work.
Although I just drove it 10,400 miles to Alsaka and back in 16 days.
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The staining in the top picture is indicative of boiling over.
The long days of driving are probably what did it. Rather than being run too low, you were constantly charging it for long periods of time. Since the Yaris doesn't have a charge controller, if it is run with little load for long periods, the battery is constantly charged at the full output voltage of the alternator's voltage regulator.