i had the chance to use one years ago (late 80s). an owner type jeep infront of me stopped and there was smoke coming out the hood. i stopped behind him and alighted with my small fire extinguisher (i forgot the brand but it had a button on top that you have to push). when the driver push up the hood, it was the battery that was burning! two small burst and the fire was extinguished! it happened in roxas blvd near baclaran.

the guy and his wife were very thankful to me and i was just glad that i was able to help them!