How much current you get is just related to how much current the cells, wiring, and connectors can handle.

It's very easy to get 2HP or 1500W from a 56V battery, that's only about 27A which is very little and works through small 12AWG wire. Most lawn care 2 strokes are around 1-2HP anyways.

The run-time is a different story though, when you only have something like a 400Wh battery, drawing 1500W is going to last about 15 minutes.

It comes down to what you need it to do. Leaf blowing isn't super critical, like if you need torque to turn something it either works or doesn't. But electric leaf blowers work fine if it's slightly less power and you need 10% more labor to finish but it goes from 25 an hour in gas to less than a dollar per hour.