This afternoon I bought a Hitachi 12V cordless drill. It was a kit and came with 2 batteries, a flashlight and charger. I plugged the charger into a garage outlet and then put one of the batteries into the charger and went into the house. T booklet says it should take about 30 minutes to charge and it will shut off. Well after abut 30 minutes I went back out to the garage and found it filled with smoke and stinking like hell. The charger was still sputtering and creating smoke. I unplugged the charger and after about an hour the unit was still warm but could be handled. The shell of the battery and the charger were both distorted from the heat and fused together. When I purchased the salesman made a point of letting me know that the unit was guaranteed for 5 years. Little did I suspect that I would be returning it within hours. Thankfully I had put the charger on the cement floor so it did not do damage to anything else.