So I have an over 30 year old matchbox car, actually an ambulance, whose battery that powers the emergency lights & siren that still functions. After my son outgrew toys the car was stored in a box in the basement for 20 years and then in an unheated barn for 5 years. My grandsons now play with it, and it still works. So what kind of battery lasts this long? Lithium ion did not exit back then, to my knowledge anyway.