ORIGINAL: alfredbmor
The normal charger is rated at 5.8 V output so it is impossible to fully charge a 6 v. battery with the normal wal wart charger, unless that you are thinking that they are fully charged when they really don't.
Yup, the norminal wall warts DO produce a higher voltage than they are rated at, which is one reason you can get away with the wall warts ( with caveats! )
However this is close enough that I'm getting ample capacity out of the pack. My peak chargers obviously do much better and can purposely charge a battery to 110% capacity, but the wall warts get within 90-96% percent of a full charge.
On a 3000mAh pack, after 2-3 days of charging, there is no problem flying all day long... if not all weekend long.