[AC Question]

My Samsung mini3 has the charging symbol next to the battery life to show its charging but the percentage continuously keeps dropping.
-When I turn off the phone and charge it, the battery symbol that usually comes up doesn't and screen remains blank, but when I remove the charging cable the phone just vibrates
-I've tried three different cables as well as a USB port
-I've also cleaned it

[Rukbat]

Turn the phone off and plug in the charger. Leave it charging for 24 hours. Let us know what happened, then we'll have a better idea of what's wrong. There are a few possibilities - including the phone having gotten wet. (That doesn't need water. Bringing a phone inside when it's been in a below freezing car all night causes condensation, that can show up as damage months later.)