The battery is fully charged, but the unit is not powering on. Remove the battery from the unit and examine the prongs and connection on both the battery and the unit to make sure they aren't damaged. Damaged prongs can cause the unit not to start up due to a faulty connection. Related articles The battery is charged but the unit isn't turning on. Has the battery reached its full charge? What are the best uses for the Heat Gun attachments? What is SharperBlade? The battery is charged but the unit isn't turning on.