Samsung NP-RC512 Laptop 15.5 Intel Core i7 2nd gen battery not good discharge.

Hi, is used is ok condition, I reset it erase all, before it was not activated when I put it to sell, now it is, you can see the picture I took from command prompt that shows is activated ,  the battery don't keep the charge it quickly discharge, dvd works is not blue ray I put a blue ray disc and don't work, but normal dvd works, you can see on pictures, any question you can message me, brings the charge, the back panel where is the screw where is the Hard drive and memory is broken, I took a picture to show, thank you, message me for any question , thank you