You don't have to run regulators with the A123s. They run a constant 6.6 volts without a drop off, but when they do drop off, it's sudden. The thing I like about the A123s is they put out over 30 amps, which means when you do a hard snap, or a really violent menuver you don't have to worry about your voltage or amperage dropping. They also recharge in about 15 minutes. In my 35%er I can get in 6 ten minute flights before I think about recharging