Scooter that can handle hills well

I ended up purchasing a electric scooter recently so that way I can get back-and-forth to work from the bus stop. So far for the past week it's been performing better than I expected for the cost that I got it for. The only drawback is being able to go up elevated areas. That's the only downside, it normally goes about 13 to 16 mph from its max of 20 mph(maximum weight capacity is 265 pounds and I currently weigh 245) but as soon as I get on a bigger elevation, it slows down to about 5 to 7 mph. I'm looking for a scooter that can retain anywhere from 10 to about 12 mph on bigger elevations. I have a budget of about$600-$700.