I would like to rent the E-chopper outside the time slots, is this possible?

What is possible at the location of your choice is indicated when making a booking or in consultation with the rental location itself. For example, if you want to start the first rental block of the day half an hour earlier and return it half an hour earlier, you need to discuss this with the rental location in advance if the location is open, for example. The important thing is that a full battery is available at that time.  Battery-wise, it's possible because the rental block after that won't be compromised.