The Winston, ThunderSky, and Sinopoly; pick your timeframe and brand the graphs look the same as they have yet their specs have changed to look more favorable. I never believed the old ThunderSky specs in comparison to the performance tests people have done and posted on either websites or forums so I can't really take them to value now. Back in the day the TS cells would sag out very low around 50% SOC at even 3C and in comparison to a CALB cell that well outperformed the TS cell down throughout the range. They seem much closer now but still different, for example Jack Rickards published tests made them look closer, but still clearly not the same. I'm curious how the Sinopoly cells actually perform now. Their 9 page specsheet that they sent me implies a 3C constant discharge is safe to 85% DOD and will be 2.8v+ at that DOD. I've said it before and its not hard to test and see that LiFePO4 and all other lithium chemistries get hot at high discharge rates, especially below 30% SOC at higher amperages and 20% moderate amperages but even 10% SOC they get warm and very saggy even with 1C. Heat kills. CALB might just be avoiding adding charts of high current discharge to their spechsheet because of how much internal resistance and therefore voltage sag varies with temperature along the SOC curve.
Sinopoly isn't mentioned much because we've already talked about Winston being the new TS but in the end it turns out the Chinese stock of TS actually belongs to Sinpoly making Sinopoly the former ThunderSky and Winston a separate company but since the facts are now recently presented and the Winston name has been present everyone associates Winston with the ThunderSky name we all remember.
Back on the form factor topic though, Sinopoly says they are shrinking cells and raising density and changing cell appearance. So either it means more capacity in the same package which works out well for those who've designed a package but don't have the cells yet or need a replacement cell albeit slightly different characteristics), or the same capacity with a smaller case which works out for those who don't need higher capacity than what is currently out there but want a smaller(and lighter) package. CALB is changing too, the gray cells have been on their web site for nearly a year now and the specsheets have been available for about half a year(if I'm remembering my time frames correctly) but they are completely different shapes and depending on the cell capacity its better or worse than before in terms of wh/weight.
