Originally Posted by simplechamp
I run my Turnigy and Flightmax 2S 5000mah hardcase packs from 4.2V/cell down to 3.2V/cell cut-off and they take back 5000mah according to the charger.
Your charger may be storing the charge data for that pack and thus factoring in the residual charge in the used pack. Otherwise, you cant charge in 5000mah into a battery that has only had 2000mah discharged or else KABLOOIE!
It may change if you change the settings on your charger to accommodate a different pack and then it will start over.
My hyperion stores this data and maintains statistical information on my packs if I either keep the setting the same or tell it to track a specific pack.
Get's kinda complicated...