I have using lenovo k3 note. bettery problem is the big issue in lenovo k3 note. long time performance of k3 note is very poor. features sound camera and design all good but long time service is very bad. network problem also in lenovo k3 note. very slow charge and bettery backup very bad. lenovo k3 note heating problem. charger was not connect regularly. I was irritated this mobile because my mobile 2 time repair in lenovo service centre.