Both versions have a passageway that leads through the atty to the battery. That's how the air activated switch in the battery works. No opening through the atty and the batterys air switch wouldn't work. The diffrence is the bridge between the two and how much you fill the cart. I've had both leak when I over fill which I have a habit of doing too often.
Liquid getting into the battery doesn't ruin it like every one seems to think it does. I fill my battery with juice more often than I'd like to admit from over filling.
Solution is simple. Take a strip of single ply toilet paper about 1/4 inches wide and a few inches long. Twist it into a rope that is thin enough to fit into the hole in the battery. Stick the toilet paper rope into the hole till it bottems out about 1/4 inches or so. Let it bottom out naturally and don't force it. It'll wick out the liquid. Tear off the soaked piece and repeat. That'll dry out the majority of the juice in the battery and the switch will work again.
Sorry for this very old reply, lol but I guess it is ALL good now that the new battery's now come with a battery protected gasket seal!

But I still feel the same, I still see some suppliers stating DSE 901b when it is a RN..
And some suppliers, doing the Right thing stating "TRUE DSE-901b" on their products because they are just so similar it is so easy to get away with selling a RN to people stating it as a DSE-901b.
I have heard some people that prefer the RN models but just in MY Experience, they have cause me lots of stress, not to mention headaches and frustration and even a thought of switching back to Analogs. I am glad now that these have been redesigned now and we even have the manual battery's now so that is a Great turn for the e-cig users.
Happy Vaping to ALL