I had a samsung J7, it’s in the drawer for many months. today i tried to charge it, there was no sign it’s charging. i changed many cables , i thought the battery is dead.
Luckily i have its original charger adapter + cable , i connected it to the phone , the phone starts up .
i don’t know if there is any difference between the original charger and other compatible charger.
Hope it help you in some cases.