Your wall wart charger will work, however it may take a considerable amount of time depending on the capacity of your pack to fully charge your pack. You should also cycle the pack at least five times before flying with it. As noted above your wall wart will work, and you can discharge the pack using a 12v. bulb to discharge at about 250 mah., though I can't recall the bulb number I used before I obtained an Accucyle which charges and discharges my receiver packs