why does my phone charges slow and drains battery so fast?

[Unisauruss Rose]

I've bought a new charger but it wasn't samsung. I plugged it on my phone and it charges sooo slow. So then I change the voltage power supply (samsung one) thing.And it charges faster. So then I went to school, (it was 99%)I didn't even use my phone much I only text. So when I come back home, my phone was 10%.
Why is my phone like this?

And another question, is it bad to have a different voltage with different adapter? (if youre asking whats the voltage and stufff.. Idk what is it..dunno where to look)

 

[UJ95x]

The stock charges (comes with the phone) will always be the best for charging, so I always stick to those.
We're going to need screenshots of your battery stats if you want a better opinion on it. Depending on your usage and settings that could be completely normal

Posted via Android Central App

 

[Unisauruss Rose]

But my adapter that came with my phone is broken. And I only have the voltage of my phone . and where do I check my battery stats?

 

[UJ95x]

Any adapter of the same brand should be fine. You can check your battery stats in settings > more > battery
Screenshots are taken by holding home and power for a few seconds

Posted via Android Central App