dnmun said:
i just think it best to avoid demanding a high discharge rate so there is not such a big problem with the heating of the cells that requires the extra weight of carrying the phase change material and the steel can for the lipo. i know people like them since you are not the first to post up about them, but i think the availability of cheap pouch packs makes them the better deal for the money. i do try to talk people out of buying the Vpower type packs because of reliability and workmanship, but do not talk people out of buying these except for the cost and weight.
I believe there to be an optimum price-performance point which a detailed comparative analysis would elucidate should any party undertake such. Unfortunately, its the usual adage of buyer beware. Meaning the onus of analysis is ultimately up to each party. There are some, like Battery University (
http://batteryuniversity.com/) which undertake what's required for a meaningful comparative analysis and maintain a good web site for ongoing publications. I'm sure its not easy. ES is sometimes useful, but the information is never particularly well organized and often times unreliable. The point is that the discriminating buyer must do their own ad-hoc comparison, taking the information available at any point in time (and that is always changing) and make the best price-performance and cost-benefit analysis. That or be held captive by the opinion of well meaning albeit almost always misinformed individuals on this or that forum site, including ES.
There are a lot of factors to consider, including not only cost but many factors in consideration of performance, as well as potential risks, like, yes, the risk of fire. The point has been repeatedly made, including myself and others regarding such risk. Some will assume it and others not. To each their own. Get on an ebike on today's streets and you put your life at risk regardless. And other factors, like the ease of use and construction, and deconstruction.
My most recent final decision before making a purchase and commit to a battery build project was in favor of the A123 26650 cell. Because of extreme longevity, cycle life. Knowing what I'm getting, confidence. The cost of a battery must be measured in amp-hours over the whole lifetime of a battery. And the longer lived, the less time I have to hassle with it, getting new product, building & rebuilding. I simply want the best cost-performance possible, taking a lot of data into account, and it has to be good data. So for me at least, its not lipo.
And for the purveyors of the
Allcell technology Summit battery, post up the data supporting total cost of lifetime amp-hours. Meaning, first, the cost of the battery - still have not seen it posted here. And then, what cells are being used? Not some generic, but whose cells, the manufacturer, by product number. So the discriminating buyer doesn't have to guess about that. And so knows what they're getting, and can do detailed comparative analysis if they want. And make a real decision regarding cost for total lifetime amp-hours. And not be subject to marketing hype, like "advanced phase-change heat dissipation materials."
