Hey Guys ( and girls :) )

I have an iphone 6 here with following problem

I have this iphone 6 from a friend , she said she cannot charge the phone.

The phone was just shutting down, she tried to charge it , but it was not possible

After investigating :

no power was left in the phone when i had my hands on.

I tried a new cable : no solution

i tried a other charger : no solution

i tried both : no solution

I tried to charge the phone during night ( when i connect it to a cable and a power outlet the phone lights up showing the battery with blinking red bar)

after charging for the night ( +- 8 hours) : nothing phone still dead

There was no indication that the battery was dying .. no problems before.

When i tried to connect to itunes : nothing...

I tried to connect to 3utools to check battery life: nothing ( because phone is so empty)

I was thinking it would be the lightning module , but he is recognizing the cable ...

so could it be a bad battery , regardless that she never sufferd any battery problem ?

Tonight i will open the phone and measure out the battery , but it would be nice if i hear your opinions...

thanks in advance

Best regards

Kevin