text: My battery was dying and the capacity was reduced to 60% after 3.5 years of usage, battery life was reduced to 3-4 hours with moderate use. After installing the battery(which is pretty easy if you have the screwdrivers) the capacity is back to 100% again. The battery life is back to ~7 hours. I have lenovo yoga 900 and you can watch the iFixit video for step by step guidance to replace the battery