Let’s say you manage one of the soon-to-be-closed Tesla factory-owned stores and, for whatever reason, you have dozens of brand new Model 3 EVs sitting unsold on your lot. What are you going to do if one of them has a discharged battery? As car dealers learned a long time ago in the gasoline era, batteries won’t keep a charge forever and cars sitting for a long time sometimes need a boost to their batteries.
That’s true whether it’s a conventional 12 volt lead-acid battery for an ICE-powered vehicle’s electrical system or it’s the lithium-ion battery pack that powers a EV. That’s why car dealerships for conventional vehicles have battery tenders, heavy duty chargers that can be wheeled around the lot to whichever car might have a dead starter battery.