bish--I didnt mean it was the same charger--what i really meant to say was it works just as well--ive never had a problem with the smart charger--I fly helis and if you go to www.heliproz.com website-they did a review on this charger and compared it to the sirius and said they seen no differance in the performace of the chargers. I have been using the smart charge for a while now and its a good unit. They said the ace is made out of the country so its cheaper....Joe