My phone doesnt show a lightning bolt

[Android Central Question]

When i charge my samsung j5prime it doesnt show the lightning bolt icon i dont know if its charging or if it isnt but i know that its not the outlet or charger's fault 'cause i tested it on my brothers phone its because of the phone

 

[B. Diddy]

Welcome to Android Central! Just to be sure -- if you leave it on the charger for a while, does the battery level go up or down?