It's a simple case of range, and then where are you going to charge it?
You won't get one hour out of the current balance of weight and power, and by one hour I mean from the shed back to the shed with a little safety margin, so 40 to 45 mins actually in the air.
Add more battery, and the extra power to lift it etches into the range expotentially, double the battery weight and likely you will go the same distance as with half.
Charging then will be some 12 to 14 hours from a typical 240V outlet in a hanger/shed, it's not like a car where you drive to an established charger and charge in 40 to 60 minutes. Though if you have 380V 3 phase available, you can knock that down to 3 or 4 hours with what's called a "Wall Charger". I charge my Tesla in 9 to 10 hours on my wall charger, but that's 70 KWh battery pack, light plane would be 20 to 25 KWh
So, you're going to fly for 40 mins, come back and put it on charge for 12 to 14 hours, hope you're close to home, because your'e not going to leave it there on charge and come back next week for a flight, you will come back the next day just to take it off charge.
It's do'able, just messy and inconveniant.
However, a motor glider is a real possibility .......