Did they fully charge the batteries before using it?
All my battery powered devices came with a warning: “Shipped with Storage Charge only. Fully charge battery before operating”.
They would have, but they didn't want to wait for 5 days.
True that. Most of the time the EV is charged at the dealer for you as part of the new car service much like a professional wash. Sometimes when an EV is bought from a dealer that is new to EV's they don't know how to charge it, even though many of them have a Level II charger on the site. So if the EV was used for a lot of test drives before you bought it, and the one guy at the dealer who knows EV's was off a couple of days, your first stop from the dealer after buying is a Level III DC fast charger. LOL
When I was test driving different EV's of different makers, when we got back to the dealer, two different salesmen told me after the test drive that they hoped I knew how to hook it up to the charger because they didn't. LOL
Of course, none of the cars I test drove (and eventually bought one of) were 6-figures like the Hummer or the Hummer's older cousin, Tesla. LOL The Kia EV6 is a good EV and much cheaper. The Hyundai Ioniq 5 is a little pricier, has a few luxuries, and made for taller people. Both get over 3 miles/kWh (3.3 miles/kWh DC power, but count a max of 10% loss from your A/C wall outlet when converting to DC during the charge). At home I can get a charging speed of 27 miles for every hour charged (I usually charge it slower at 15 miles/hour) in either of my 240V outlets. On trips at the Level III road chargers I get 250 miles in 10-15 minutes. (The last 50 miles of charging on top of that take another 15-20 minutes if I want to wait on it to slow charge to keep from damaging the battery. But that's good if we're stopping longer anyway to grab a bite to eat.)
If I'm in a big hurry on a road trip and don't want to stop every 200-ish miles (read: my wife isn't with me asking if she can stop ever 200 miles to walk a bit), I take my ICE pickup. But if she's on the trip, her every now and then needing to stretch her legs are conducive to the EV's range and charging speed.