Why won't my BCD704C1 turn on?

There are several possible causes if the unit does not start: the battery pack may not be installed correctly, the battery may not be charged, the internal components may be too hot, or the brushes may be worn. Check that the battery is properly seated, verify the battery charge, or allow the tool to cool down before retrying. If brushes are worn, take the tool to an authorized service center for replacement. (Page 12)