You would be wrong. Please educate yourself before mouthing off. Not all EVs are battery. Hydrogen fuel cell vehicles are EVs but they don't carry all their stored power in a battery. They are called FCEV. To differentiate between the tyes, we call one a BEV, the other a FCEV.
When you want to use Lithium Ion batteries, or similar, simplicity is out the window. The charging system needs to be intelligent, you need a battery monitoring system and the battery requires active cooling up to and including its own AC system - not to forget heating.
Want simplicity - back to deep cycle lead acid batteries with limited range but less complex needs.
Sorry, the world has moved on and such pieces of crap are no longer task effective.