The amp-hr rating for large car/tractor batterys is based on a 20 hour rate. Smaller batterys, for example motorcycle batterys tend to be based on a 10 hour rate. Assuming a 10 hour rating, the 26 amp-hr battery would put out 2.6 amps for 10 hours at which time the voltage would have dropped to 10.5 volts. The 20 hour rate would work out to 1.3 amps for 20 hours before the voltage drops to 10.5 volts however, in your case I believe the 10 hour rate applys.
Since you have a stash of these batterys I do not see why you would not take a set and try it for starting use in a small vehicle. The sealed lead acid batterys I have run across are typically the AGM type. I plan to use a 14 amp-hr motorcycle battery (sealed AGM) for my lawn tractor - I am tired of buying lawn tractor batterys. I tested the MC battery under a 100 amp load for 10 seconds and the battery maintained 10.3 volts. The good battery in my new lawn tractor maintained 10.4 volts. I believe it should work - go for it.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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