S3 neo charges extremely slowly if it does at all

So I let the phone get below 15% the other day and I plugged it into a charger from an older samsung device and continued browsing. Before I knew it the phone was at 0% and it just shut down. While still plugged in, the phone made a few attempts to boot up but at the end I had to get the battery out. After getting the battery in and plugging in the charger again the phone didn't show any signs of life. Like I hard bricked it. After a few desperate attempts the screen flashed and a few minutes later the phone booted up like it normally would (This happened while it was still plugged in). Now it just won't charge as quickly even with the fast charger. The phone normally gets pretty hot while charging, now it just stays cold.

NOTE: I had it charging trough the night with the old charger but it didn't go over 15%.

I am running Ressurection remix 20150714.
I think it's got something to do with the hardware, and if it is, would the warranty fix this?

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