I believe it to be a measure of how much "energy" it has put back in the battery - simple calc of amps on charger and time...
This is correct! I have the duo charger and had another hyperion before that. The mah displayed is what the charger put back into the pack. Also as Arct1k had said a few posts back the balancer drains some mah to keep things in balance. So if you have a 4000mah pack that you run to the lvc it could very well take 4100-4400mah back into it, that would just mean that the cells where slightly out of balance during charging and it drained some off one cell. Thats something I've tried explaining to a few on here before but the insist that there zippys have 500mah more capacity than what they are rated at! Sorry for the rant!
That makes perfect sense to me.
E-Revonut
Since you have the duo, have you tried to sync charge? I attempted it the other day, but it didnt seem to function (charager just gave that blank stare......)!
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES