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You're probably reading the Ah capacity of the batteries ie the Amps x hours before discharge.
The battery will only gives the Amps needed by the mounting - around 2A.
The big "truck" batteries are a PITA, and quite a load to lug around, as well as the possible problems with acid leak..
I'm using successfully a collection of 20Ah gel cell batteries and a electronic charger, I also use one of those car computer transformers ( 160W) which gives 15V from 12V input. This gives enough voltage to get good slewing etc.
The EQ mount is OK at 15V.
Hope this helps
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