If your asking about the two house batteries, they are located behind the first door behind the entry door. They are protected by a black cover which can be removed by twisting off the wing nut. I believe they are sealed maintenance free batteries though.
2 house batteries should be first access door on coach to the right as you exit coach. Mine are not maint. free. I have a quick filler on them so makes monthly filling easy.
The other is in the front behind the engine grill gates.
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