Carl's Monster Battery Packs
Carl Gulbronson brought in one battery pack from a Twike (a fully faired electric assist trike), a box with compartments for lots of C-size NiCad cells plus some circuitry to control them. It uses several such boxes for a total of 280 cells in series (or 336 volts nominal!). He has found a very cheap source of NiMH batteries in Taiwan and wanted to know whether he could just swap them for the NiCads and what trade-offs might be involved.