Jerry W.
Nissan's eelctric all come with battery compartment side panels as standard - this is why they do not require a "EE" rated battery. However, other companies like Yale Hyster etc. Offer EE rated units with or without battery compartment side panels. You need to "belt and suspenders" your approach (do more investigation - check with your local Hyster dealer, if not friendly with them find one that you or your company is friendly with) on the Hyster unit before you tell your customer the wrong thing - could be an expensive resolution
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