Can you charge a 7.2 volt charger to 4.5 battery?

It is not recommended to charge a 4.5V battery with a 7.2V charger. Batteries are designed to be charged at a specific voltage and using a charger with a higher voltage can damage the battery or potentially cause a fire. If you need to charge your 4.5V battery, it is best to use a charger that is specifically designed for that voltage.