Hi I am curently using windows 10, before that i have windows 8 and my battery goes to almost 2 hours, i don't know why? it should be more that that. but when i upgrade to windows 10 now it goes to maximum 40 min on battery saver.. Is there any problem with my battery? is there any way to check that my battery is dammege or not? My system specification and modle: HP Pavilion Sleekbook (15-b003ee) 4GB Ram, 500 Gb hard, 4-cell battery, 1.7 GHZ, Please help i am very tired with this battery.