Share your experience!
Perhaps is my only problem but, could somebody confirm it?
After Kit Kat upgrade, if I switch on stamina mode only below 30% battery, for example, the stamina mode will remain on always, not only below 30% battery.
Anybody else with this problem?
Try this:disable stamina mode,go to settings-apps-all-eco mode controller,force stop and clear data.Restart your phone and try to do that again.I will check on my Z1.
Still the same problem.
The stamina icon is always shown, despite the activation value.
Tested on my Z1,it seems you are right.Always on,even if you set it to start at a different percentage.
It would be great if this issue were solved in this week update. 
The new update should start the rollout today.
Great!!
Kudos for Sony 
I've already updated.
The stamina problem appears that it still not solved with 757 firm.
Another minor bug: In Settings->Data Use, in the roll about data use cycle, appear A LOT of date useless until the end, where you can set the cycle.
@JAnguita wrote:I've already updated.
The stamina problem appears that it still not solved with 757 firm.
Another minor bug: In Settings->Data Use, in the roll about data use cycle, appear A LOT of date useless until the end, where you can set the cycle.
Hi!
I saw this issue for some weeks ago. Set stamina mode to be enabled when 20% left of battery. When doing that the icon indicated stamina mode was enabled already at 100%. Although when checking , I could see that stamina mode wasnt on. It wasnt turned on until battery under 20%.
So my conclusion is that this is a notification issue and not a real issue since stamina mode is not on until below limit.
I have mailed Sony about the problem, but no confirmation. I guess they dont consider it a real critical issue.