If it's working fine, it should be ok. I'm giving you the official line because exploding batteries are no joke. Personally, I only use Samsung chargers.
I'm not saying that it might explode, I'm just warning that Samsung has very specific recommendations about charging their batteries and that they are there for a reason. There is always a very small risk when charging batteries. You can minimize this by never leaving a charging device unattended for a prolonged period of time and by charging it with official Samsung products.
Only use original charger and use protective battery setting to charge phone only to 85% and not lower than 50% discharged. This will keep cells healthy and charge phone to 100% every 3 months
