Charger won't charger iphone 4S, is it the charger or something wrong in the outlet?

Charger won't charge iphone 4s. My iPhone is fine, everything works except the charger… When i go to charge it overnight, and wake up the next morning I see it only 4% charged when the night before it had about 23%. The boyfriend bought a new charger and it worked, I threw the old one out. But now after about a month its happening again. I don't know if it's the outlet… My dad got me a new charger yesterday and It's working now… But will this one only last a month too?

Added (1). I know its not my phone because my boyfriend tries to use the charger and its the same thing… So we end up throwing the charger away…

Hi if you use not genuine charger that can happen is working just for short time so is better to pay few bugs more to get official charger, that xtimes spend money for not genuine products witch can also damage your phone or cause fire of your house. In case you using genuine chargers then is something wrong with your phone.

Buy a genuine charger

The plug itself doesn't fail too much( if it's genuine) it is generally the cord or cable which is the issue normally

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