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.
No one ever seems to discuss which hole this is happening in first lol