The majority of my
batteries are from Bloog because I bought several before finding SI and they are still working just fine. They are the same as SI's unsealed ones were. I have 1 of the 102mm and it doesn't seem to last any longer than the 78s and sometimes I think it is even shorter, but that could just be my imagination. The draw is no different though, and they take just a little while longer to charge. But it isn't worth the price difference.
I have just 3 SI
batteries: 1 78mm unsealed, 1 78mm sealed, and 1 65mm sealed. I like the unsealed because the draw is the same as all my other 78mm unsealed ones. But I'm not all that happy with the two unsealed ones - the draw is definitely airy. I have to hold it where the carto meets the battery to block off some of the air. Because of this I hesitate to
buy any other colors (these are both black). Not sure if I just got some duds or if anyone else has noticed this too?
I got a couple of the 102mm when they first started carrying them. It seems as if I have to draw on them much harder then the 78mm or the 65mm (this could be all in my head of course) any way for that reason I don't use them much but when I do I don't notice that they last much longer then the 78mm. But they take forever to charge.