The reason for the eyewash is that a battery explosion or other accident could result in sulfuric acid in the eyes. You better be able to get to the eyewash immediately and without being able to see well, if at all (remember you have acid in your eyes?). The faster and easier you get to the eyewash, the less likely the acid will do permanent damage. Probably not much likelhood of being electrocuted while using an eyewash, regardless of proximity to chargers.