Bosch’s CLPK234-181 18-volt max 2-tool combo kit is constructed to withstand the most demanding jobsite conditions. Currently if you purchase CLPK234-181 you will receive an additional Free Bosch High Capacity 18-Volt Lithium-Ion Fat Pack Battery (BAT619G) (Online Only. This combo kit is extremely compact and lightweight with professional grade performance tools. Bosch is known for their revolutionary state-of-the-art lithium-ion HC batteries. The CLPK234-181 combo kit comes with two lithium-ion HC batteries that provide extended runtime. Bosch’s HC lithium-ion batteries run up to 50-percent longer than competitor batteries. They can also perform in harsh temperatures as low as negative 4-degrees Fahrenheit (negative 20-degrees Celsius). Besides being long lasting and optimal performers in cold weather, these lithium-ion batteries also work smarter with the integrated battery fuel gage.