awsum140 Posted June 24, 2016 Author Report Share Posted June 24, 2016 Love the "scientific" methodology we're applying here. It does give "real world" results, though, which are more important to me than what a bunch of test gear might show. Link to comment Share on other sites More sharing options...
dwcraig1 Posted June 24, 2016 Report Share Posted June 24, 2016 I plan on letting the battery just live in there, if the HD2 fares better it will just stay in there for a long while.I'm not expecting to be noticing any difference but we'll see. Link to comment Share on other sites More sharing options...
awsum140 Posted June 24, 2016 Author Report Share Posted June 24, 2016 I'm happy with the HDs even after trying an HE. Yeah, lower mah rating but heavier CDR. I have three I rotate through in my ERM/DNA75. I'll have to make a decision, though, when I get my low tank, side by side, DNA75s built...HD or HE? Link to comment Share on other sites More sharing options...
scooby Posted June 26, 2016 Report Share Posted June 26, 2016 Still a bit to do to finish this off, but after a lot of thought I think this is a good if not perfect solution. Link to comment Share on other sites More sharing options...
awsum140 Posted June 26, 2016 Author Report Share Posted June 26, 2016 That looks good, Scooby. Where'd you get that tube or did you make it? Link to comment Share on other sites More sharing options...
scooby Posted June 26, 2016 Report Share Posted June 26, 2016 It's the Fat Daddy vapes one mentioned in post 18 earlier in this thread. The solder ring is a bit flimsy for 14 gauge and the nut only clamps it to the nylon disc. I did away with it and soldered direct to the nutthen encapsulated it in Sugru. There was no need to slice into the tube but I felt it would give my less than dexterous hands a bit more room to work. Link to comment Share on other sites More sharing options...
awsum140 Posted June 26, 2016 Author Report Share Posted June 26, 2016 The red top insulator threw me. I have some of those and will be using them in DNA75s I'm working on. I was planning on drilling out the screw and soldering into that. Link to comment Share on other sites More sharing options...
scooby Posted June 26, 2016 Report Share Posted June 26, 2016 That's a good idea, could even swap it for a meatier screw. Link to comment Share on other sites More sharing options...
jurdanas Posted July 10, 2016 Report Share Posted July 10, 2016 My opinion:Not a good idea, when the battery is working (hot) - is growing, not working (cold) - is declining. Appears spaces. You destroy battery. Link to comment Share on other sites More sharing options...
awsum140 Posted July 10, 2016 Author Report Share Posted July 10, 2016 I've gotta ask, how much to you think the battery expands, in length, when it gets warm? Link to comment Share on other sites More sharing options...
VapingBad Posted July 10, 2016 Report Share Posted July 10, 2016 18650, which is what this thread is about, don't externally. Link to comment Share on other sites More sharing options...
awsum140 Posted July 10, 2016 Author Report Share Posted July 10, 2016 Even if they do expand when hot, normal operating conditions shouldn't produce that much heat. Expansion might be a few thousands of a mm until it's hot enough to "cook off", then all bets are off. Link to comment Share on other sites More sharing options...
BillW50 Posted July 10, 2016 Report Share Posted July 10, 2016 I saw a video on youtube showing how much lipos expand and shrink through charging and discharging cycles. And it was surprising quite a lot. Either in that same video or another one explained why 18650s and other canned cylinder shaped batteries don't. The videos must have been over a month back, because I can't find them in my history. Link to comment Share on other sites More sharing options...
VapingBad Posted July 10, 2016 Report Share Posted July 10, 2016 18650 can expand in very extreme conditions as has been demonstrated with a couple of tube mech mods where the battery has swelled and sealed the tube at very high temps, but I don't believe it is an issue here. Link to comment Share on other sites More sharing options...
BillW50 Posted July 10, 2016 Report Share Posted July 10, 2016 Yes of course. Although I was thinking of during normal operation. I believe one of the videos mentioned the reason why 18650s doesn't swell like lipos is because they are wrapped too tight to swell. And if it is physically impossible to swell during normal operation like 18650s, you give up additional capacity. Link to comment Share on other sites More sharing options...
VapingBad Posted July 10, 2016 Report Share Posted July 10, 2016 It just an appendix to my last comment Bill and not at your or any other post in particular. Link to comment Share on other sites More sharing options...
scooby Posted July 11, 2016 Report Share Posted July 11, 2016 I've read in 'Battery University' that cylindrical batteries don't expand.The battery is quite a loose fit in the tube diameter wise, and any slight expansion in the length, if there were any, will result in a more secure connection and be taken up by the give in the pos terminal.Don't forget that the brass tube will expand also.I don't think battery expansion with this setup is a issue. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now