I don't know how...but the same 7.2v pack I had been charging with my old MRC Superbrain 959 seems to really be putting down the power now. I was struggling with a hover on the heli before...but now its cake....really weird! I look at the charger as an investment...I have to have a charger afterall to charge my R/C Nitro packs, now I am into electrics, and who knows...maybe one day I will be into large nitro Aircraft and need a charger for the retracts and stuff!