ok so I got a lipo system for my birthday (september 5) and i got a hyperion 0403i and a hyperion 4270mah cx 7.4v pack. heres what i don't get..... when i plug it it after it is out (7.460-7.420) and then after charging it is 8.412v, why is it 1v higher then what it says? why don't they call it an 8.4v because it's max output is 8.4v?