Is this normal...

[JDM_SOHC]

When my battery gets low, not even like faded screen low, anytime i use my phone it shuts off and goes into airplane mode, than if i turn off airplane mode an phone back on an make a call it does it again..?? Of course when my phone is like faded screen about to die low, it does it as well but i always thought it was just a P.I.T.A. thing that i was gonna have to deal with.. However, i asked my friend an he said thats not normal... Anyone got some insight on this one, i searched but didn't know what else to search for after finding nothing...