I was just looking closer at the manual battery I have... I've read the manuals are better for dripping because they're sealed, but this one looks like it's not. It's hard to see in the fuzzy pic, sorry, but the hole in the middle is open, no plug or anything, and down at the bottom there is another hole that looks like it opens into the parts below.
The USB pass through also has a center hole, but that one looks closed at the bottom. Hard to tell for sure though. These are the V2s I got before finding out about better deals here.
The USB pass through also has a center hole, but that one looks closed at the bottom. Hard to tell for sure though. These are the V2s I got before finding out about better deals here.