Ok guys here's my quandry! I'm not quite satisfied with my build, using PB's its a little slow and a little short ranged so, this wendsday I will augument my 120v pack with an additional 24 volts ( I happen to have a couple of GP 27's 12 volts in my RV) and see how they preform on the highway for a short range. ( just an experiment) If that is good I will consider adding another 4 GC 225's to my pak ( another 270lbs arrrrrg) my 1231c and FB4001 are rated to 144v, I would also need to reconfig the Zivan charger for 144 volt charging OR try to sell the PB's ( their almost new) and switch to your Lipos which I know would be great but still expensive. now If I chose the switch to Lipo's could I still use the Zivan ( top charge 165 volts) to charge the Lipo pack ? (#44 to 3.75volts top ) for a pak voltage of 140.8 yipee? is the PB algorythem not acceptale for lipo's? see my lou-ace in the garage for spacifics. ya know it's almost criminal that they can advertise a PB battery at 225 amps that really will only put out about 100 Ah at 2C oh well.