My Montana has the standard CH750 lock on my battery access panel under the king pin. I wondered why they used a more robust lock on all the other outside hatches and then used the CH750 on battery and generator compartment? I don't know why.
But, you can always swap out the existing lock with a more robust one that will look the same and not draw attention to it. You can check with any RV dealership parts store and they should have replacement locks for the standard CH750.
I would not attach something like a hasp with a padlock. That's definitely an attention getter. But the best way to protect the batteries from theft is to simply keep them hidden, out of sight. Don't brag or rag-on with your RV neighbors at the site that you have these batteries and ... make sure your camper is fully insured. Remember the old expression, "Loose lips sink ships." Tell no one what you have, and no one will ever be tempted.
