I didn't catch that since I doubled the mAh -parallel, duh- the Cx total mah would give me 40 amps which is perfect ......about the voltage.... I know what to do.At 200 watts? Gack.
That must be a serial wired mod, double the volts. At the battery, current is watts over voltage, which is where things get dicey as the battery fades. Amps get pretty high, pretty fast with these mods.