It's an obsession but it's pleasin'
The difference is that with the bare battery on the FW7 you have to open the oven chamber and lose all your built up heat and then you have to maneuver the fresh battery into it's position, taking care not to damage the wrapping, all while being under the influence of the first part of the session. Not a major issue, I know, but I was surprised at how much I appreciated not having to deal with that on the FW8. Now I just pop out the spent pack and pop in the new one and get right back to it. Old guy being lazy? Yes. But it works for me.How does a proprietary battery alleviate the first point? You can still run out of juice mid session, now you just slide on a $30 molicel instead of a $5 molicel.
Edited to add: The FW8 is finally up on Marc's site: https://firewoodaromatech.com/. Got it's own page and everything! Better sit down before you look at the price of a replacement battery pack, though. It's worth it to me and I'm fortunate to be able to spend that kind of money on a proprietary battery, but I imagine if someone is on the fence about the battery pack idea, this might push them over to the "no thank you "side of said fence.
Edited again to add: I just recalled Marc saying something at some point about maybe offering a battery replacement service where he would swap in a new cell. That would certainly cost less than a whole new pack. We'll have to wait and see if that becomes reality once he gets through the early adopter rush.