You should never leave any battery in a hot car, I think that's something everyone should of been warned about when they started vaping.
But Innokin said not to use your car to charge the Disrupter.
I understand this because the same goes for Smartphones too, should never use your car to charge them. I learned the hard way

I called Samsung and Motorola and both said the same thing, You should only use a car charger in an emergency only

Most cellphone service providers like Verizon, AT&T, Sprint, etc, don't warn people because

A. Maybe because they sale so many car chargers and don't want to hurt the sales.
B. Maybe they know your battery will stop holding a charge and you either buy a new battery or a new phone?
C. Maybe they don't care about nothing but money?
Me personally, Any kind of adapter that is plugged into my cars cig lighter, I would do test with a volt meter to make sure.