How long a tablet’s battery lasts determines how long it can be used away from a source of power. Battery life does depend on what use it is put to, with streaming video tending to use more power than reading an ebook. Switching off unused services, such as WiFi, can also help prolong battery life.
The battery life of the LeapPad Ultimate is listed as being five plus hours. This isn’t the best life, but neither is it the worst. Should the tablet be used on the go in a vehicle, then an in-car charger can be a good idea.