why is my battery life always cut short

[AC Question]

why is it my battery life isn't always what it says it is even tho iv charged it over and o er even when it's connected it ****s off ehats wrong with my battery or is it my cell phone

 

[belodion]

It could be a bad battery, or something else.
Post a screenshot of your battery usage stats after charging to 100% and using normally until at about 40%. Tell us your screen brightness and signal strength.