I have a Chrome Torpedo from Totally Wicked. It does not have a sprung center pin; it has a solid post. I believe it is made from copper since that's the color showing where the chrome has worn off. It does read resistance. Dunno what kind of Lavatube this makes it. It uses flat top batteries.

The kit came with 2200mah lithium ion batteries. I need new ones. TW no longer sells the 2200mah, but they have 2600mah. Will they still fit? Site says they will, but I'm not sure how much larger they are from 2200 mah. It doesn't look to me like there is room for bigger batteries than I have now.

I don't care much about hardware, so I may be a vaping vet, but I'm a noob when it comes to batteries. I just want them to work.