said by elios:check the cell chemistry on the fast charge cars there not Lipo they are using Li-Fe/A123 which you CAN charge an insane rates
Many production hybrid cars have been switching over to lithium polymer since Hyundai did it back in 2008:
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green.autoblog.com/2008/ ··· battery/The Elantra LPI HEV will be the first car in the world to use lithium polymer rechargeable batteries ... significant advantages over lithiumion batteries including higher energy density, lower manufacturing costs, being more robust to physical damage and they can also take more chargedischarge cycles ... said by elios:... with the Powerlab you can link up to 16 of them lol to run of the setting of 1 IF you REALLY need that much
Powerlab appears to be the end of innovation for RC folks.
Anyway, your original problem is solved by a multi-phase DC-DC boost converter: more phases = more current @ constant voltage.