Len — short of using a load tester that discharges the batteries, the most reliable way of testing the capacity of batteries is using something like a conductance load tester:
https://www.amazon.com/gp/product/B00IZFNJ6Y/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00IZFNJ6Y&linkCode=as2&tag=carbattcharce-20 <http://www.midtronics.com/shop/products-1/battery-and-electrical-system-diagnostics/intech-series-battery-conductance-testers/midtronics-intech25-battery-conductance-tester> Yours to have to pay a few hundred dollars for a decent one; but the prices have gone down and the quality has gone up at the lower end. — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Feb 6, 2017, at 1:23 PM, Mitchell's via CnC-List <cnc-list@cnc-list.com> > wrote: > > Here is one for you electrical guys, my batteries are over 5 years old. I > have all LED lights, a 240 watt solar panel and modern refrigeration. The > batteries are working fine but there is no way they are still performing as > new. I would like to monitor their amp hour capacity as they age. Is there a > simple way to do it or do I need to take them into a battery shop? > 90 days to launch! > Len Mitchell > 1989 37+ > Crazy Legs > Midland On.
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