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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