Dhofar, thanks for your reply. Yesterday I've done another test...: Disinstalled all the programs that I'de installed in the tablet. Reset the system to factory setting , charged at 100% and then left in sleep mode (without any program running and no scrinn activated ..) testing time to time the battery charging level. Here the results: 01:15pm 100% 01:24pm 98% 01:57pm 93% 03:10pm 84% 05:10pm 69% 06:00pm 61% So in 5 hours has lost the 40% of battery charge running just the idle process of W8. It sound quite a lot to me .... About the resource monitoring , also with the application running , and I'm mainly referring to Adobe reader or Firefox browser, there were not evidences of high CPU or memory usage.