Hello , my s4 i paid since aug13
suddenly i was listing to music bettary was 51% .. i opened Facebook and the phone rebooted and when the phone started told me that bettary is 0% and reboot again .. Never stop rebooting until i remove the bettary .. to open my phone again i must put in charger and when it start to charge tell me the bettary is 51% and charging ,, that happened 3 times and not by the same percent ,, 21% , 46% , 51%..
what the solution ?

 

So what was the cause to take care in new bettary ?