I use Amerex extinguishers, have them serviced every couple years from a local fire ext sales and service co. 5 pounders in my trucks, 10 and 20 pounders in my shop and at home. I have had an electrical fire in my truck while driving, under the dash near my feet, pulled over and used the extinguisher. Have had to use the extinguishers at work also. Had some employees in the shop jumping a truck with a dead battery, went out to check on them and they had cables hooked up and one truck charging the dead battery, they started another task and were not paying attention. When I came around the corner the vehicle being jumped had the battery burst and started flaming, grabbed the 10 pounder on the wall and it was out in a second. They had the jumper cables hooked up backwards. I always have plenty of extinguishers around after those 2 incidents.