A123 batteries

OK Brian, my ICE charger have a CC/CV charge profile, for li-po (3.7v/cell and li-ion 3.6v/cell).
So i consider that if i select the li-ion profile, i'll be able to charge the A123 pack???

My charger can only charge 4s li-po, so it will charge also only as li-ion, so if i buy a DeWalt pack on Ebay, the only thing i'll can do is to make a 4s arrengment, right?

But can i built a 4s2p? and please, tell me the difference between a 4s and a 4s2p configuration. Is on the 4s2p i'll have twice the runtime of a 4s configuration??

Last, could you tell me what's the capacity of the A123 DeWalt pack in mAh??

Thank you very much ;-)

Ho! forgot to ask, at wich amps can i charge this pack, should i charge it at 1C like li-po cell??

David