If the DC motor has permanent magnets (like most battery powered drill drivers), then you can just turn the wheel and get electricity from the input terminals.
The advantage of such a high powered unit (horsepowers) is that you don't even need gears to take advantage of concentrated sources of energy, like your own body weight, or sacks of grit.
As you probably noticed by now, when you are in barn territory, then your mental scope finds wider focus.
You can make good batteries and capacitors on the bucket or barrel scale, with far less toxic materials than Lithium or Lead.