I'm absolutely in love with this trimmer/shaver. Following the instructions, you must charge it for 1 hour before it's first use. Battery seems to last forever with no loss of power. For such a light-weight trimmer, you can feel the power of it's motor, very comparable to their much heavier plug-in models. Blades are very high quality, love the screen shaver attachment. The rotating head gives you better/more comfortable angles.