As far as I understand, neither Shockli, nor PLB really have their own developments, and if they have a real production in which they work with the very stuffing of their batteries (and not just engaged in dressing the outer shell under their name), then this most of the stuffing they take already finished form from someone from the largest manufacturers. Maybe, then one, then the other, then the third or fourth. And then there is some mysterious fifth national Chinese manufacturer, which supplies its most important stuffing under the name “INR26650-50A” and “INR26650-55A” for most of the elements, for example, for the manufacturer of PLB, LiitoKala, and many many other nameless. To make sure of this, you just carefully look at the market, where most of them even do not want to change the shell of the basic “INR26650-50-55A”, because it also costs money. Only some of the sellers decide to make a cheap sticker on the surface of these “INR26650”, for example, as does LiitoKala. They do not even hesitate to say loudly about the discharge current = 20A, and indicate only 15A for confidence. At the same time, they made an “update”, instead of 5000mAh, they now write 5100mAh )) 5100mAh
What about the size of 26980 can I say? These are elements that are based on the same “INR26650” filling, only the size of its internal roll is increased. Yes, they really should be better, but everything is relative. Better than what? This very “national Chinese basic” stuffing perfectly does only some then one manufacturer (the fifth one, unknown to most of us). But, since this filling is the national treasure of China, other manufacturers of batteries for batteries also have the right to make it. That is, make copies of it. I think that it is impossible to acquire the original stuffing, because it goes for the military needs of China. Therefore, such manufacturers sellers like Shockli, LiitoKala and hundreds of others can only choose between copies of the INR26650 filling. Someone chose a better manufacturer, someone worse, but in the end, according to the graphs of our esteemed HKJ, you can see that many of the elements have a very similar character of their bit characteristics. With only minor differences. And this is normal, because it is impossible to make absolutely identical copies in everything.
Shockli, for example (4300-Green), has a very noticeable problem at the beginning of the start at high currents, after which a pendant bag suddenly appears at the line, which then rises back to the main discharge line ( https://i.imgur.com/SKWqUWC.png ). This is a very big disadvantage because the reverse lift only seems like a good thing. In fact, it is due to the rapid heating of the element and the reduction of internal resistance in just such a negative way. This will affect the resource, which will be much lower than those of elements for which this effect is not observed. Another way out is it is not to shock Shockli with large currents in order to avoid such sagging at the start in the form of a temporary bag. And can anyone say why HKJ never showed its own measured data on the internal resistance of the still cold (before connecting any loads) Shockli-5500? - “Calculated internal resistance (ohm) - xxxx (ohm)” ??..
Samsung T-30 3000mAh original - today you can not buy it. Only original fakes (no letters in the title “TB” and with slightly different sizes from the original) Sammmmsung T-30
Well, or here is such a frank trash (apparently, also with a familiar filling of the type “INR26650-50 \ 55”) 21700 T30 
Golisi-4300 S43 Gold… the lowest price? 
QB26650 INR26650 5000mAh 3.7V 20A :question:
