What happens if you disassemble the battery?
In any case, there will be a lot of dirt, both alkaline and saline - as a rule, manganese-zinc and contain, in addition to these two components, graphitized carbon, and the whole thing is in a steel shell. You can burn yourself with alkali, although there is not so much of it, but when you open the battery, it can explode (it is unlikely that the shell can be destroyed without significant effort). Well, many other types of batteries - lithium, nickel-cadmium, nickel-metal hydride, silver-zinc, etc. will have their own characteristics at showdown. In any case, it is risky, it is better to refrain from it.
If it is alkaline, it can burn the skin. If the salt is manganese-zinc, there will be a lot of dirt from coal with manganese dioxide. If this is not a galvanic cell, but a battery, then it is better not to take risks and not disassemble, especially if the battery is metal hydride: metal hydrides often ignite spontaneously in air. In my case, the newly synthesized lithium aluminum hydride, left in air for drying, ignited and completely burned out with a violet flame. As soon as the ether evaporated, the substance ignited. And here's a video in which a stone was thrown into a battery to break it: https://youtu.be/-miezNLFozw
Clear business. What will happen. There will be a disassembled battery.