How Does An EMP Effect Batteries?
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An EMP can damage micro-circuitry. A typical lead-acid battery won't be damaged, however if you have fancy charging systems with circuit boards there could be a problem. All the crap made today with all the 'Smart Technology' is at risk. Appliances, automobiles, smart phones, computers, etc.
Mostg lithium ion batteries have voltage controllers that would be fried. Did a write up on this before, a nuclear EMP airburst 150 miles (distance could be wrong) over the US would knockout the whole country. In my belief, an EMP is the USAs biggest threat, you could blame it on a solar flare and watch the US tear itself apart..
When I worked for a water and power utility, we would always install our PLCs and UPSs in metal cabinets with surge protectors to shield them from EMPS. Many critical facilities are protected, nonetheless, there will by pain.