@OF I know you like numbers and science so take a look at these charts and graphs and letter-number combinations that make me question my sanity. Might be a bit revealing for you WRT current battery discussion:
http://www.intaste.de/community/dtf/technical_information.pdf
Also I've found the VTC5 to be much more favorable compared to my AW IMR. Longer battery life, more consistent hits throughout, though I'm subjecting them to sub-ohm ejuice vaping (.8ohm single coil). I get a lot longer battery life with the VTC5, whereas with the AW IMR I could run the battery into the ground in a day. VTC5 is giving me a solid day and a half of no worries.
Thanks, I've seen similar graphs and (of course) tend to stare at them some. Look, for instance at the 45 or so point on the recharge, about 80% where we'd expect this guy to be after 5 minutes or so of serious discharge. Reading the voltage scale says were what, 4.0 Volts? That's .2 less than the fresh charged one, a much larger drop than internal resistance causes. I say the 'lesser' battery will provide more current (and therefore heat) at that point.
They all do this, of course, voltage (and therefore current) drops more or less linearly as they discharge. Assuming say a one Ohm load they start at 4.2 Volts (and 4.2 Amps) for
17.6 Watts. When discharged, say 3.3 Volts we're down to 3.3 Amps for a total of
10.9 Watts. That's a 38% drop in power, way more than the possible differences in internal resistance can cause in charged batteries of different types. I think.
Likewise I think AW IMRs may do very well, but agree their capacity is much less......but we're not talking capacity here.
I don't doubt for a minute the Sony batteries are a good choice, I'm just not sure they're enough better than otherwise good batteries in common use to justify buying a bunch of new ones (and trashing the older ones?).
I may end up buying one just to play with it, but to be honest I've got a bunch of good 18650s I'm plenty happy with.
I wonder how a 'blind' test would come out? Would guys pick a 'five minutes old' Sony over a fresh Panasonic? Could they even tell you the difference without peeking?
No, I was referring to the high capacity, low current batteries, like the 3000+mAh 8 amp batteries, especially those with a protective circuit board. (the CH is a great cell; haven't tried the PD; the 1600mAh AW IMR is also a great cell, but the VT5 has 900mAh-ish more useful capacity over the AW IMR).
And what's wrong with an additional 10 or 15 minutes?
There IS a web site with tests of a jillion different batteries, and will allow you to overlay the discharge curves at multiple loads. I'll dig up a link in a day or two, or just search a zillion of my posts in the Thermovape thread...[/user]
Thanks, makes more sense now. Nothing at all wrong with more run time, the very reason I use the Panasonics not the AW IMRs........
I recall that site (at least I think we're talking about the same one.....) and bookmarked it, but seem to have lost it in the last computer adventure.......
Like I said, it might be time to invent a 'Cera battery tester'.
OF