Hi Roland, I never thought I'd see you buy lithium-based cells. Lead acid seemed to work very well for you...was it mainly to reduce weight?
David, If you look at the discharge curve on the hybrid auto center site, max voltage is 4.2V, the average cell voltage is around 3.7V to 3.8V, and they are discharged to around 3V to remain above the "knee" of the curve where V drops more quickly with Ah used. Their mass is 3.8 kg/module, so kWh/kg is about 2*3.8V*66Ah/3.8kg = 132 kWh/kg. Liyuan sells some cells that are over 140 kWh/kg (mainly due to lighter packaging I think), but much more expensive - on the order of $1.50/Ah - CALB has similar, the CAM72 cells which are about the same price from Keegan, much higher from Jack R. These Leaf cells are different chemistry than the more common (among DIYERs) LiFePO4 which has the voltages you mentioned. -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/Need-Lithium-batteries-tp4672019p4672054.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
