New charger for our s3 neo

Hi. My S3 neo original charger not charge my phone with full power. Now I'm use CM 12.1 and when I charge ma phone it charge about 500-600 mA but the charger has output 1A. Now my phone charge from 0-100 % almost 4 hour (On stock everything was the same so I think that is charger). I want buy a new samsung charger but in my country( Poland) in most electronic shop is universal Samsung charger but it have output 2.1 A. This is safe for battery and phone or better search for 1A charger?

from xda-developers http://ift.tt/2cyyaGo
via IFTTT