You are able to access the safety of such a device from one or two cycles against standardized loads, freshly manufactured or reused. If safety or fires would

You are able to access the safety of such a device from one or two cycles against standardized loads, freshly manufactured or reused. If safety or fires would be truly a concern, costly test would be mandatory every year for each battery powered device. Battery connection and test modes would be standardized, to check the rest of the device for shorts and isolation etc. Usually those things are glued together with epoxy and sufficient testing is impossible without destruction of the toy.