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A batteries life span is a direct result of how it is treated. Batteries are like electronics, if you want them to last, take care of them, protect them, keep them fully charged, and keep them at ambient temperatures.
WHY?
A battery is a chemical reaction in flux.
When not fully charged, it decomposes.
A cold battery works harder to provide power (cold retards the chemical reaction).
A hot battery works harder to charge (heat retards the chemical recharging).
Fully discharging your battery reducing the number of cycles you should expect by a factor of 2-4x (Keeping the chemical reaction in the middle is easiest on the system).
Now remember, each manufacturer has different specs. I have seen published specifications on batteries as low as 300 cycles at 50% DOD. However, for premium batteries, like the Sun Xtender AGM solar batteries, you should see 1000 cycles at 50% DOD and nearly 1500 cycles at 40% DOD.
www.sunxtender.com/manual.
If you cycle your system once daily, to 40% on average, you should get at least 3-5 years of service from the system. If your batteries are inside and you cycle to 40% on average, expect to see 4-8 years of service.
If you drain them all the way down, they can die in 6 months.
For more information look at these links.
http://www.bdbatteries.com/sunxtendertest.php
http://www.sunxtender.com/pdfs/Sun_Xtender_Battery_Technical_Manual.pdf
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