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I'm no expert, but I have done a huge amount of research into batteries in the past 6 months to get the most out of my project. I think you need to use one of the higher power density options vs higher energy density. IE A123/Kokam/Headway. The usual Thundersky/Calb cells just won't give you big HP, so you will be trading range for power given a similar price point. I personally will be using a 288v nominal pack of 10ah Headway cells with a total capacity of 70-80ah this will give 1000A upto whatever voltage the pack sags to at that load. Coupled to a soliton1 and Warp11 HV it should give pretty good performance and reliability without pushing any one component too hard.
 

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You will lose about 20-30% of the range in exchange for double or more peak power depending on your system. For me it's a good trade off since I was planning for quite a bit more range than I really need, so with the headways I will get over 100km at 80% dod but about 2.5x the peak HP of a thundersky pack for about the same price. For my build it's the right choice, your results may vary.
 
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