If it's been in the shop for 5 months and they didn't take care of the batteries, they may have killed them.
You should be able to charge them in place. A battery charger should tell you if they are charged.
A battery disconnect in the rig won't help with the 'parasitic drain' that most rigs have.
You can install a battery disconnect switch on the battery itself that will stop the drain, or just disconnect the negative battery cable.
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2015 Dynamax REV 24TB class C
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