Charging can be easy where you live, but you need to arrange access to parking and charging points. At school may not be so easy.

Consider revising your budget upwards to about 3000 min, or getting a pedal bicycle, or planning your exploring to allow for the limitations of whatever machine you buy, you may get lucky and find a cheap machine with 50km range.

If your battery runs out while you're riding around the city, you can also charge it in one of the many underground parkings for 3-4rmb.

Kunming has a lot of slopes, so a 30km e-bike/e-scooter might only be good for 20km if you often drive on Qingyun Jie.

How about check the buy and sell section, under classified~