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A hydrometer can be used to check a battery (as long as the battery is
not sealed since you have to measure the fluid). Go to google.com
and search on "hydrometer battery" for more.
The OEM batteries seem to have a rather short life (3 to 5 years with
most people reporting 4 years on this board).
Heat is the biggest element that cuts battery life (they sell more
batteries in texas then in colder climates) so where you live affects
battery life.
Johnson Controls makes a pretty good battery (sold as DieHard, Duralast, Energizer, Equalizer, Eveready, EverStart, Interstate, Kirkland Signature, Motorcraft, OPTIMA, ProStart). They have a lot of good battery
basics at this web site:
http://www.johnsoncontrols.com/automotiveBattery/default.asp
Finally, I've always replaced my batteries when they fail. There often is
not much of a warning before that happens.
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