Battery Life goes down after installing windows 10

#1
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.
 


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