Strange issue in my sony xperia z

[karamelakimo]

I bought the phone from about 10 days

it's a great phone really...I like the screen i'm shocked from those say the screen isn't good it give a reality imagin with pictures and movies it's perfect..the camera espicially love it ...the walkman application also and sound and many things in it

and thanks god i didn';t face prolems in wifi or anything else after having last update

I really love it..it was my dream

but i faced an issue with battary it's not a big deal but i wanna know

1st day after full charge 100% it says it will stay for 4 days and some hours without stamina mode

and with stamina mode it was up to 8 days it's great so i worked without tamina mode it's so fine to me

but after 2 days of moderate use it's 19% and i'm satisfied with that so charged it again it say it will stand for 2days and some hours and  with stamina mode 4 days

i wroks fine at the second day it was saying it will stand other 1 day but suddenly after 15 min from seeing 1day it say it will stand oonly 8 hours

why this sudden drop?? i didn't do anything hard!!!!

i chargd it again to 100% and says it will stand 1 day and 5 hours without  stamina mode

and now after 1 day and 3 hours of mild use it still 85% and stay say will stand for 1day and 1 hour

is it an issue??or it's a prediciton about my last use of phone or what???

plz tell me

thx in advance

[Samuel1]

If you don't look at the predicted time, does the phone last as long as it first did or does the battery drain faster? When a phone is new it takes a few charging cycles (10-15) in order to get maximum capacity out of it. It might be hard for the stamina mode at first to predict the battery time when the battery is all fresh. Make some tests and see for how long the battery works and ignore what the phone predicts right now and see if it's still consistent.

[karamelakimo]

no it lasts as it first did

it drain normal with normal use and hard with heavy use ..it works fine 2 me

yesterday it show will stand 1 day and 1 hour but 2day without chargeing it rasie up to 1 day and 10 hour""  after 8 hours of sleeping and phone is idle ""and sometimes the opposite happen and sudden drop to say 20h after few minutes from last time i saw

my only question why this change in tme appearing after few hours .. sudden drop ... sudden raise???

[Samuel1 · Accepted solution]

Well, as far as I know it calculates the battery time based on how you are using the phone. If you for example play a lot of games for some time and browse facebook while listening to music, it will think that's your normal usage and calculate the battery time from that. But if you for example just have the phone lying on your desk while working for a few hours it won't drain much battery at all, and will calculate that as your normal usage and give you "more" standby time. I guess it tries to learn how you are using the phone and make an assumption on the battery time based on how you use it basically.

[karamelakimo]

i thought that also but i wanted to be sure

thx 4 your reply

I love sony xperia z