That looks like a lot of liquid for it to be condensation. It can get quite humid here too and the temperatures are in the hundreds most days of summer - so I am in and out of fierce A/C and temperature changes. I've never seen condensation that bad before. Not saying it isn't, but it looks excessive to me.
Just on the off chance, have a smell of the liquid inside the battery compartment. If it's e-liquid, it will be obvious, If it smells like vinegar, your battery leaked. If it smells like nothing, chances are, then it is condensation.
If not, I am not sure what to suggest, maybe pack in a small pack of the silica beads you get to absorb moisture inside the battery compartment or something. I think you did the right thing contacting VS, perhaps they can come up with a better solution.