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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