My tria age defying laser is 3 years old and has been used heavily. Battery used to make it through two cycles on level three before needing recharged. Recently can only last one cycle. Tria customer service said battery is not replaceable and new unit must be purchased and offered 50 percent off new unit if I send mine back. I will replace my unit as I am NOT interested to find out what will happen if I stop using my laser. My skin is smoother and has an even healthy glow. I use it during my lunch break at work and find it therapeutic.