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Thankfully most of the models you can purchase arrive just about fully assembled. There may be the odd bit that requires attaching but it shouldn't be a main of frustrating job. This is great as your children will be eager to try there new toy.
So now to some more practical considerations. As will everything battery powered they are going to want recharging. With a fresh battery you should virtually obtain about 2 hours of driving time. As the battery is recharged as time passes the power of the battery will certainly reduce so it will not last for as long after being charged.
Although they are toy card for kids they can be quite heavy if you are arranging a longer trip probably to the shops or local park then make sure the battery is fully charged beforehand. You don't want to be far from home when the electric battery runs down as it means you are likely to have to push it back.