If a battery has an energy storage rating of 26 AH then YES three in paralell would amount to 78 AH. The AH rating has to do with how much TIME a battery can supply x AMPS before the voltage drops to a certain level.
Unfortunately if all the ones in paralell arent equal in their capacity/condition the weaker can suck power from the stronger ones which is why when multiple batteries are used its best if they are identical in size and type and age and rating etc.
ALSO the AH rating is only one of other design considerations. A battery designed for starting can deliver high amperage for a short duration while one designed for deep cycle is more for slow lower amperage discharge over a long time period, so I have no idea of the type of service the batteries you have were designed for so I just cant say how well they will perform in whatever your application requires
Soooooooooo yes it can work (depends on your application and the application the batteries were designed for) but the more connections you have the more chances for problems remember
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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