I simplify life by using rechargeable batteries. So many times I had to look at disappointed faces when the batteries of a favorite toy or game stopped. Amazingly the entire family has jumped on board. When the batteries lose power, we go to the zip-lock bag that holds the charger and 'already charged' batteries, pop the 'run-down' batteries in the charger and plug it in to the electrical outlet till charged. We put the 'already charged' batteries in toy, PRESTO- happy faces and less stress. I have used the same batteries for at least 3 years!