Battery life estimation

[Ju_Lian_Khoo]

Hi guys!! I'm new to this forum, lets straight to the point that I want to discuss. And sorry that my english is kinda bad 

Im currently using Xperia Z5 premium, my phone was fullly charged and the battery estimation is 26 hours +/- (stamina mode was off) Is this normal?? I thought it supposed to last up to 2 days? 

And this 2nd picture is from my girlfriend phone, exactly same model. There's 1 time she brought her phone to service center to repair the microphone, and she asked the person to check the battery as well, few days later she went and collect her phone and the technician told her that they repair the microphone and change to a new battery. Her phone was 80% and estimated 44 hours +/- (more than a day). So Im wondering what is the thing that causing this problem. Thank you for you help in advance

[Uliwooly]

@Ju_Lian_Khoo

It could last up to 2 days with moderate use, there are myriad variables that will shorten this. 

We'll need more info to better assist you

charge the phone 100% use it as you normally would then once the battery reaches 10%

settings > power management > battery > take screenshots of:

1. the list

2. tap on the graph and take a screenshot

3. back > tap on the top 4 items on the list > take a screenshot of each 

post them all here or upload the screenshots to box or dropbox or google drive or etc and post the link

[Ju_Lian_Khoo]

I'm not a heavy user, I dont really use it while im working. Just whatsapp, quick phone call that's all

[Uliwooly]

@Ju_Lian_Khoo

post the screenshots whenever you can, keep in mind that whatsapp will drain your battery fast. 

[Ju_Lian_Khoo]

I'll screenshot it at the end of the day.

[Uliwooly]

@Ju_Lian_Khoo

check the list of required screenshots.