The shockli maintains a higher voltage at a given point in the discharge, but that doesn’t mean its IR is lower. The IR determines how much the battery will drop its voltage (the resting voltage minus the voltage under load) at a given current. At a given point in the discharge curve the shockli will have a higher resting voltage than the LK because its capacity is larger, so even if the shockli drops a bit more voltage than the LK the voltage under load will still be higher than the LK because the shockli started at a higher resting voltage.
Essentially the vertical spacing between the discharge curves at different currents is proportional to the IR. In this case the shockli and LK cells have very similar IRs so the shockli’s extra capacity gives it the advantage in pretty much all applications. Comparing the Sanyo 20700A and B cells is more illustrative. At the 5A rate the higher capacity B cell maintains a higher voltage for most of the discharge, but at the 20A rate the lower IR A cell pulls away and is the more suitable cell.
What is the purpose of such 60A test? That is discharging the cell in a quite stressful trial, about equivalent to start discharging the cell with a load of about twice the cell's internal resistance for most of those, with quick load resistance tapering off.
He doesn't uses 4 terminal holders for accurate voltage monitoring, so some current proportional drop should be substracted from added to the curves, at least this is what he told me on another cell review discussion.
Originally posted on Fri, 05/05/2017 - 02:34; lil fixup.
I have so many batteries that have “60A” printed on the wrapper, I was curious as to how batteries would actually perform at 60A. This one charged up ok after discharging at 60A, so I suspect it has a temperature interupt device rather than a current interrupt device.
I wouldn’t go by the results from a West Mountain Radio CBA. I have three of them, but only use them for continuous current testing on NiMh batteries and ICR Li-Ion batteries up to 5A. The slew rate is far too slow for high current testing.
There's a little voltage difference among those curves, likely caused by the associated current travel path resistance to Mooch's voltage monitoring probes. Addressed by me in his review of it.
With regards to the actual limitations of the West Mountain Radio CBA, I have no idea besides knowing Mooch's setup is highly customized and improved.
Oh! By the way, 3.2V as high discharge cutoff? This is something I've somewhat got used to hearing from the E-CigaretteForum (LoL!). In my opinion, it is a very high and inadequate value, though of course I can understand its purpose.
There's no doubt their perspective/approach in all of this battery management stuff is quite different from mine. I always (or nearly) keep my li-ions at a max voltage of 14/15 charge voltage to maximize cell lifespan. Knowing how stressful is discharging a cell at around its effective limits/ratings, my philosophy tells me it is wiser to discharge at a slightly slimmer ratio (divide max by √2 as P = I²R) in order to substantially reduce thermal stress in continuous discharge. For pulse discharging, I'd limit myself to about the continuous rating or very little more.
P.S.: yes, the ANR26650M1-B is a real high discharge champion. Good offers for it in AliExpress.
Hey guys, i like shockli brand, new windy fire product line, i have windy fire 18350 series light and it works great on the quad xpl hi v3. i dont know if it the battery or driver… the light doesnt step down from the 2 minutes on high.
So what?? How soon can we order the new shockli 5500 Mah?? If it take very long, i will just get the shockli 4200 mah for $8.49 each,…
now the /www.mtnelectronics.com have some promotion for shockli 26650 battery ,if buy shockli 26650 battery you can get a zipper case .you can see the picture .
Same… I know mtnelectronics.com. I ordered lots of unprotected 18650 from there before. They do not have 5000 or 5500 mah shockli 26650… I will keep checking this page for an update… thanks.
The Shockli zippered hard case is handy for more than just battery storage. (Note: Won’t hold both images at the same time)
Top picture= 2 @ 26650 cells
Bottom picture= Lumintop Prince Mini + Copper Tool + Windyfire 14500 battery