6 month before I purchase a new panasonic eluga A4 smart phone.after 3 month I got my mobile battery charging process became verry slow and charging power gone empty verry fast. I changed many chargers but I not get any positive responce.after some more days I got my phone battery power became so lasy that I am unable to do any work in mobile. After 6 month we went to panasonic service centre and talk about my phone problem.they checked and told that mobile battery became dead and they demand 1500 rupees. Till now my phone is in service period but my battery service time became over.at last I changed my mobile battery from local mobile shop.