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Hello eveyrone,
I was just hoping that you could help me understand how to efficiently maximize my battery life of my Z1.
I noticed that when STAMINA mode is turned off, the standby time decreases but the "standard" time usage is longer.
However, when STAMINA mode is off, standby time is longer (6-10 days), but the "standard" time usage is shorter.
How should I go about this? Should I always turn Stamina mode on to save battery? Or are there instances when I should deactivate Stamina mode to maximize my Z1's power? Why is this so?
Thank you. 
Try the basic, repair your phone with SUS or PCC and check again
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if your network coverage is poor it will drain your battery, also since your phone is new it will take few days for the battery to work properly, its normal do check this FAQ thread(s)
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mate you really have nothing to worry about.. plase remember that at 100% charge the phone is really fully charged..
however, the minute you start using the phone its running on battery and 99.9% charge is considered 99 not 100 since they round down to give you enough time to reach a charger port...
hence 5% could be 5.01 or 5.99...
Its something thats always happened with most smartphones.. the rest of the battery dropping im uncertain as to why that is happening.. check your background apps.
He is right - if your mobile network signal is weak your battery could drain that fast. Check if the reception is fine. If it has full bars, then it's a problem. I've had this happen to me while I had an SD card inside. The card was eventually fried (not sure why), and after removing it the battery went back to being insanely good in standby, as it should be by design.
Assuming you have good network coverage, your phone could potentially last 17-18 days in idle mode, with STAMINA on.
is that faulty?