Bad battery backup. It cannot work 2hrs countinuously. Very bad experience with this laptop.The product did not come upto my expectation of working. It was fine for 2 weeks and then the problems started. I got into contact with HP as it was still under warranty to replace it, their were many hardware issues which were pointed out by the customer service and hence they are not willing to replace a defected piece.So a very bad impression at start itself. Its services are very bad.