(Clackamas County, OR) -- Officials are reminding residents of the importance of properly disposing of batteries. Clackamas County says firefighters have responded to three fires over the last week that were burning in garbage trucks. One fire was caused by a battery on a power tool, another fire was caused by a battery on a vacuum cleaner, and the third fire was started by an unidentified battery. In the Portland area, you can safely dispose of batteries at the Metro South Hazardous Waste Facility, or other businesses that collect batteries for recycling.