Hi I have a Samsung s4 I9505 running android 5.0.1 stock
The problem I'm having is that if I try to turn on my s4 while running on battery it never passes the Samsung boot logo, it turns off instantly after the boot process finishes
However with the wall charger plugged in it boots up and works perfectly fine but if I turn the plug off it switches off 40 seconds or so after
Another thing I must add is the power button on the faulty s4 seems abit different to my other working s4, the power button on this one doesn't have to go in that much to turn on or off so little pressure can turn it on. Its a bit more clicky on the other s4. But it still boots up fine with the wall charger so may not be because of this.
Also sometime I can see the s4 at 45% battery and after turning it off and back on after 20 minutes its something like 14%
Funnily though I can boot into recovery with just the battery and leave it there for half an hour and it doesn't turn off
What could be wrong?