One battery, two voltage settings. Use this high performance lithium-ion battery with Atlas 80V tools for ultimate power and performance. Install the battery in an Atlas 40V tool and it intelligently switches voltage, giving up to 2X runtime over a 40V 2.5 Ah battery. Powers Atlas 80V and 40V tools Fuel gauge displays state of charge Rapid charge time Industry leading quality Li-ion battery cells individually balanced and tested to meet the highest performance requirements Thermal control extends life and runtime by minimizing heat Impact resistance prevents failure from drops and vibration SKU(s) 57014 Brand Atlas Battery capacity 2.5 Ah (80V), 5.0 Ah (40V) Battery type Lithium Ion Battery voltage (volts) 80 Shipping Weight 3.22 lb.