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RV Battery Life Expectancy The life expectancy of your RV batteries depends on you. How they're used, how well they're maintained, how they're discharged, how they're re-charged, and how they are stored all contribute to a battery's life span. A battery cycle is one complete discharge from 100% down to about 50% and then re-charged back to 100%. [VIEW ARTICLE]Comments RSS Feed For This Article: 
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 Deb writes:Subject: crossed wires Okay, totally stupid, but I crossed my tent trailer wires on my battery, the trailer was electrically hooked to my van. All the side lights came on, I disconnected it and tried again, finally I realized oops the wires are wrong (the wires are black and white, but the battery is red and black) The battery appears dead, I keep trying to charge it but none of the trailer electrical will work off the battery. Is there anything I can do or have I fried the battery? Comment provided August 1, 2009 at 11:49 pm
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Subject: Battery life expectancy
Much of what you said is true. However, the most overlooked cause of battery failure is chronic undercharging. We recycle thousands of pounds of batteries each year, most are only a couple years old.
Most people don't even know they are damaging their batteries until 6 months to a year after the fact. If a battery is undercharged for periods of time, anywhere from 15 to 30 days, the amorphous arrangement of lead sulfate (think powder) that is left on the plates begins to crystallize. The crystallization of lead sulfate renders that portion of the plate useless as it is a poor conductor of electrons. Bottom line: make sure your lead acid batteries are 100% charged on a regular basis. BTW, the blinking light on most RV charge controllers does not mean they are charged.