Phantom drain is something that just about any rechargeable battery device will experience. In this case, my guess is that you're referring to an issues some were having early on where this was exaggerated and causing some issues for people leaving their car at airports for prolonged periods for instance. This has been fixed via software updates for quite a while though and doesn't really represent a significant issue other than a slow and predictable drain if you leave it sit for long periods w/o being plugged in. This is the case for ICE vehicles too though so not really anything unique to EVs.
There are also battery technologies in development that will also help in this area among many other more dramatic upgrades in current charging technologies.
As to the liquids statement; the only liquid in Tesla vehicles is the windshield washer fluid, brake fluid and the coolant mixture that circulates to keep the batteries warm for optimal charging & discharging. Sure these could leak but it would be very unlikely and (other than the brake fluid) is water soluble so it would dilute in a rain storm or with a garden hose and be safe for the environment and not leave the cruddy oil slicks you see in parking spots and that I used to dread whenever riding motorcycles. For someone like me who likes to keep their driveway and garage floors spotless this is a great thing to not have to worry about a drip during an oil change or from a leak. Whenever I pull up to a convenience store for an energy drink or pulling up to a stop like on a busy road I'm constantly reminded of one of the negatives of ICE cars that will eventually be a distant memory.




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