It leaks down the middle of the post onto the battery.
You don't need the o-rings you where talking about in that link then, those where for thee tank. You need small o-rings to fix the leaking down the post. There's a few different ways people have been doing that type of leak fix mentioned in this thread. Here's the way I did it and what I posted a few pages back. Since I've done this modification to my noble 1 I haven't had it leak a single drop since then.
Here's the post I made on it:
Okay, here's what I did and this thing is working perfect with no a single leak whatsoever... I compleatly threw out the top plastic wash and bottom o-ring that came with the Nobel.
I used two different size o-rings that I ordered from eBay. I will attach pictures of the paperwork I received with the o-rings that state the sizes used, and the company I bought them from. Both o-rings are high temperature o-rings commonly used in paint ball guns and scuba diving equipment.
I'm sorry I don't have pictures of me putting the o-rings on during the modding process, but I do have pictures of the finally product. I used the same process for the top of the positive post as I did for the bottom of the post. On each end of the post, I used two different sized o-rings (the sizes are in the picture of the paperwork attached to this post).
I first places one of the smaller o-rings around the brass post... this o-ring is a bit hard to get on because it has to stretch to get around the post... but this is exactly what we want because it makes a liquid tight seal. The other perfect thing about the o-ring is It's diameter once stretched is the same size has the hole that travels up the center of the tank (the hole the brass screw/post slides into. Then I place the larger of the o-ring onto the post and screw it down with the nut. This o-ring further helps is making a juice tight seal, and also keeps the nut from touching the aluminum body which would cause a hard short if it didn't.
For the top of the post, I did the exact same thing... put the super small o-ring on first, then the bigger one second. Then I tightened down the nuts into the o-ring. in the tightening process, the smaller o-ring that went on first gets squished and jammed around the post, and also into the center hole that travels up the center of the tank area. This makes a perfect seal around the post and the center tube. The bigger o-rings keep everything nice and pretty and insure the brass post doesn't come into contact with the aluminum of the mod in anyway, Plus since the bigger one is also an amazing tight fit around the brass post it makes a second barrier to keep juice from leaking.
Here's some pics, now your only going to see the top bigger of the two o-rings in the pictures because the smaller on that went in first in squished perfectly around the brass post and in-between the center shaft/tube the brass post slides into: