Samsung Galaxy S5 Android System Battery Drain

I have consistently found that my battery drains with a wild speed on this phone. I have tried all the tips I can find and yet I still have to charge it twice a day whilst at school if I don't want to go into the critical 5% zone. Even if I leave it on airplane mode for most of the day, the battery still drains way too far and fast. Sometimes my phone will freeze up, and I get a lot of errors about system/com functions stopping or not responding. Just writing this has taken me down to 4%. Any help is appreciated!!

I'll attach a photo in a moment.

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