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Thankfully most of the models you can purchase arrive just about fully assembled. There could be the odd little bit that needs attaching but it shouldn't be a major of time consuming job. This is great as your kids will be eager to try out there new toy.
So now to some even more practical considerations. As will everything battery powered they will want recharging. With a new battery you should just about obtain about 2 hours of driving time. As the electric battery is recharged over time the energy of the electric battery will reduce so it will not last for as long after being charged.
Although they are toy card for kids they could be quite heavy so if you are setting up a longer trip maybe to the shops or local park then make sure the battery is fully charged beforehand. You don't want to be definately not home when the electric battery runs down as it means you will have to push it back.