Faulty battery

[flash2243]

Have a problem with the xperia zl battery. When the charge is below ~ 50% phone suddenly turned off. After connecting the charger the phone said that the charge of 5-6%. Once fully charged, it starts all over again.
The phone works for almost 3 years. whether its battery life has dried up?

[MarlonUk1]

can you show a screen shot of your battery usage in the settings>

did you recently installed or updated any apps before the problem started?
try to do a power cycle with your battery, http://science.opposingviews.com/power-cycle-android-battery-21217.html

also try to repair your phone using PCC.

if the problem still persist. have your phone checked up on your local service center

[flash2243]

Right now my phone is fully charged, so I will post screenshot later. New programs I did not install, but I have recently updated next apps: automatic call recorder, google maps, google docs, google+, skype, smart connect, tunein radio pro. All these apps I using a long time ago.

[MarlonUk1]

try to observe your phone if the problem happens again..
also you try this on safe mode. to make sure that the problem is not caused by an app>

do not use any battery saver or ram manager apps as they are useless and may cause more problems.

also try to check your power saving settings.

[flash2243]

I'm pretty sure the problem is not in the programs: the problem manifested itself three times; the first and the third time was running Chrome, in the second - qr scanner. In all cases, at the time of turning off the charge was 50%. I do not use battery saver or ram manager apps (exclusion is built-in function stamina). Also during these reboots message appears about updating the applications as if the phone to update the firmware (which is about the optimization the applications)

[FrontierGate]

"The phone works for almost 3 years. whether its battery life has dried up?"

You definitely need a new replacement battery.

[flash2243]

That's the sreenshot