F40 is pretty solid but yeah hills will definitely slow it down, especially with teenagers who want to go fast everywhere. Maybe look at something with more torque for the hills - dual motor setups handle inclines way better than single motor. Just make sure whatever you get has good brakes because going downhill in hilly area can get sketchy real quick
With your weight, almost any adult scooter is suitable for you. Given the short travel distance, scooters with small batteries are also suitable. I would consider Ninebot scooters, as they have more reliable electronics, and the mechanical parts are also quite reliable. For example, Ninebot scooters Es series (Es1, Es2, Es4), F series(F25, F35, F45), G30, G2 (used ones can be bought for $ 300, and this would be the best solution for the money), E2. Of all the scooters listed, the Es series has a folding mechanism, which makes it easier to store it leaning against the wall, placing it on the front wheel, and using a wall mount. Other scooters can also be stored in this way, but due to the design features, they will bulge strongly from the wall, and it is not very convenient to put them on 1 wheel.
Xiaomi scooters also performed well, such as the m365, m365 pro, etc.
Inexpensive kukirin scooters can also be considered, but they often have mechanical problems, and the electrics sometimes fail, although due to their mass production, spare parts for them are cheaper than for other scooters.
The only advantage of this scooter is that it is very compact. But all other technical characteristics do not differ from scooters of the average price category. In addition, it is quite expensive for the same average price category. The weight is 16.2 kg, so it's not even light. You need a compact scooter when traveling, not a compact scooter for storage. And the main problem with any device with moving parts is the breakdown of these very moving parts. The more moving parts there are in the device, the more often it will break. This additional folding mechanism will cause a lot of problems. You will also have to put your feet to the left and right of the frame to ride this scooter. This is not only unsafe, but also not comfortable. The natural position of the legs when riding is when one foot is in front and the other is behind, it is safe and comfortable.
In fact, all scooters with a standard handlebar height are much more comfortable to drive for people of low stature, as it is more physically comfortable when the handlebar is in the chest area, rather than in the waist area.
Almost all new scooter models weigh more than 15 kg (rather more than 16 kg). If the main thing for you is weight, not shock absorption, range, maximum speed, and all that modern scooters offer. It is worth paying attention to the old models of scooters. Xiaomi m365/1s/pro, Ninebot f25/f45/f2/e2. These are excellent scooters, lightweight and reliable, and they are quite inexpensive.
I like these better and I would never buy a hyperscooter. I bought my Ninebot F40 as soon as I could afford it and I think this type of scooter is one of the few perfect things in modern times
Im also a teen that commutes to school by escooter. Segway-Ninebot is a pretty high-quality brand in my opinion. For the purpose you gave the Ninebot E2 or E2 Plus II is a pretty cheap but still solid fit. I currently use the C2 Pro, its a kids scooter and Im very over the max reccomended rider age for it but I its cheap and gets the job done for me. But except for the few times I go somewhere extra, school’s only 1.8 miles for me, and for his longer range its probably better for him to get an E2, E2 Plus II, or maybe even an F-series if you want to get fancy (though I doubt he’ll need the power of an F-series).
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