It's like 10% per 30 minute drain when browsing or playing gta san andreas.
And 10% per 25 mins while sketching.
All of these with the least brightness possible.
Whilst I just performed a battery antutu tester and the result was like 20% per hour max brightness and wifi.
I aslo have battery doctor.optimizer installed.
It was like it from the start. But I didn't noticed it much.
P600 4.4 xxund2.