Why is my battery draining suddenly to zero?

[AC Question]

I bought a Samsung galaxy S6 edge a month ago, and the battery was good by the time. But these days; whenever it comes in the range of 20%-45% it just drain to zero and shutdown without any warning or low battery signal. Pleas help

 

[Rukbat]

After it shuts down and you get it running again, check Settings/General/Battery. Tap the graph to get the second graph. If you see a sudden drop to 0, the battery is throwing a dendrite (a factory defect that's unfortunately not covered by warranty - the battery is only about $10, but I strongly recommend that you let a repair shop replace it, or you can cause more damage than it already has [like ripped wires]).

In the future, start looking for an outlet when the battery gets down to 50%, so that you'll be charging it before it drops below 40%. Regularly discharging to 20% is much too low to get any kind of longevity from the battery.