5FUNCTIONAL DESCRIPTIONCAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before adjusting orchecking function on the tool.Installing or removing battery cartridge12 3012153• Always switch off the tool before installing orremoving of the battery cartridge.• To remove the battery cartridge, slide it from thetool while sliding the button on the front of thecartridge.• To install the battery cartridge, align the tongue onthe battery cartridge with the groove in the housingand slip it into place. Always insert it all the wayuntil it locks in place with a little click. If you can seethe red indicator on the upper side of the button, it isnot locked completely. Install it fully until the redindicator cannot be seen. If not, it may accidentallyfall out of the tool, causing injury to you or someonearound you.• Do not use force when installing the batterycartridge. If the cartridge does not slide in easily, itis not being inserted correctly.Battery protection system (Lithium-ionbattery with star marking)For Model BHP4531012128Lithium-ion batteries with a star marking are equippedwith a protection system. This system automatically cutsoff power to the tool to extend battery life.The tool will automatically stop during operation if the tooland/or battery are placed under one of the followingconditions:• Overloaded:The tool is operated in a manner that causesit to draw an abnormally high current.In this situation, release the trigger switch onthe tool and stop the application that causedthe tool to become overloaded. Then pull thetrigger switch again to restart.If the tool does not start, the battery isoverheated. In this situation, let the batterycool before pulling the trigger switch again.• Low battery voltage:The remaining battery capacity is too low andthe tool will not operate. In this situation,remove and recharge the battery.Switch action1009084CAUTION:• Before inserting the battery cartridge into the tool,always check to see that the switch trigger actuatesproperly and returns to the "OFF" position whenreleased.To start the tool, simply pull the switch trigger. Tool speedis increased by increasing pressure on the switch trigger.Release the switch trigger to stop.Reversing switch actionA B1009086This tool has a reversing switch to change the direction ofrotation. Depress the reversing switch lever from the Aside for clockwise rotation or from the B side forcounterclockwise rotation.When the reversing switch lever is in the neutral position,the switch trigger cannot be pulled.1. Reversing switchlever1. Switch trigger1. Star marking1. Red indicator2. Button3. Battery cartridge