Quote:
Originally Posted by Sunline Fan
The water is all up (I did check that), but the hydrometer wasn't liking it that much.
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Congrats! You da man.
Of all the ways to test a battery's static condition, a hydrometer is best. 1.265 = 100% charge (12.7V) down to 1.155 = 25% charge (12V). This info is widely known, but I am amazed at the number of folks who own expensive batteries but haven't spent $15 for a good hydrometer.
And by good, I mean the glass tube with the float inside you get at the NAPA store. (Forget those cheap things with the disc.) You must be able to accurately read down to the hundreth. As a mechanic, I ignored the decimal and treated the measurement as a whole number.
What a lot of folks
don't know is if the reading between two cells varies by 50 or more, the battery is kaput. If a cell reads 1.260 and its neighbor reads 1.210, the battery is no good regardless of the fact that a voltmeter will show the voltage to be 12.5V.
Teach
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Wright Ellis and Penny Sedgley
'10 Tundra 4X4
SOB -'14 Rockwood 2604WS (
Rocky)
"Life is a cruel teacher. She gives the test first; the lesson then follows."