Again, I don't recommend protected cells. But if I had to, well, the ones I mentioned in post #3695 sound good. A GA cell with a quality protection circuit allowing at least 10A should be bout the best you can get.
I just sent an query to Jon at that store asking what the Seiko PCB in there has as a low voltage cutoff threshold. If it's 2.5V, that would be great. I think I'd buy a set just to test them. All the major brands I know of are using Pana 3400's at best, but the GA 3500 is definitely a better cell.
Richard at MtnE has some good protected cells, though they max out at ~7.5A with a 2.75V low voltage cutoff, so not a good option currently for Narsil/Q8. I probably need to bump up the Narsil cutoff from 2.6V to 2.8V or 2.9V solely because of protected cell usage. I think some protected cells have higher cutoffs though.
Great great job despite the noted issues!
The 5k+ lumens is inspiring, not mentioning Tom’s little adjustments that went above 6k!
@The Miller: I can’t imagine how demanding this (and the other) project is already but i really wish you or someone would take a bit of time to maintain a one paragraph project status summary at the top of the OP, with a few numbers and links to the salient posts like the one above. With hundreds of interested members and close to 4k posts that makes a lot of people having a hard time to find out where we’re at…
Put those links together just the other day for my own use - should have forwarded them to you. Had a pain posting them here - exported from IE, edited in Notepad from the html...
Do you know how the VTC4 compare to VTC6? Exept for the lower Ah capacity of course.
I have a bunch of VTC4 (like over 25 pc) that I use for various flashlights, and I was kind of hoping that they would work fine for the Q8 aswell.
Think I might have VTC4's, but they are old. +1 with TA's post above. The low capacity is not ideal, but they will sure work well, probably initially more amps than the 10A cells like the GA, MJ1, or 35E, but will degrade fairly quickly as they discharge.