Looking at a 3rd party battery for the big leaf blower since the Ryobi OEM are $150 for 6AH. This one is ~65. But the label says "36V (40Vmax)." So I wonder if its going to be straining the motor by providing under-voltage. Seems to me the blower is always at "max" - very hard to throttle the trigger on this one. The blower is a something402 - the put the label on the bottom where it scrapes on the ground!