The above info is good. My thoughts are unless you running big stuff like 1/4 scale it seems easier to just stick with 4.8 volt packs. If you want longer lasting packs pick up a pack with higher capacity. I switched the Nickel Metel batterys which have no memory in the 1400 and some are 1500 mah. I charge the pack on Friday night for Saturday morning and I can fly all weekend on these packs on the one charge.