I have a Halotron fire extinguisher in my car.

This Fire Extinguisher successfully extinguishes Class B and C fires by cooling and smothering and will not provide electricity to the user. Halotron Extinguishers are intended for use in areas formerly protected by Halon 1211 hand portable extinguishers. HALOTRON I is a "Clean Agent" HydroChloroFluoroCarbon (HCFC) discharged as a rapidly evaporating liquid which leaves no residue. Halotron is pressurized with Argon gas and is an EPA and FAA approved agent.

For the following types of fires:
Class B: Flammable Liquids and Gases - gasoline, oils, paint, lacquer, and tar
Class C: Fires involving live electrical equipment

A short video can be seen here.

Yes they are more expensive but provide a "cleaner" result if one needs to use it.

Regards,

280SE Guy