Would an EMP destroy unprotected and ungrounded batteries? Would it damage them in any way?
EMP is only a problem where there is an antenna to pickup the EMP energy. Even then, the energy picked up must be strong enough to do damage. Sensitive microcircuits can be damaged with as little as a few microJoules of energy. In general (a broad generality) a device can take as much EMP energy as it normally operates at. Even an AA battery stores 10 kJ, and can deliver 10 Watts for a short time. Stored batteries without any antennae shouldn’t be susceptible to damage. .