If possible take the loaner scooter for a trial run at home. You can go to a park, zoo, museum to try it out.
Newer scooters tend to have longer battery power. Larger scooters have two batteries to last longer. Your own weight factors into the battery power, too. Being careful to shut off the scooter while watching a show or fireworks gives you a battery that lasts longer. If you use Disney transportation make sure you shut the scooter off while going back and forth from the parks.
Make sure to take the battery charger when getting the loaner scooter. Carry the battery charger with you at the parks in case you need an emergency charge. Make sure you recharge the scooter every night. Pay attention to the battery guage.