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Why does my iphone 5s drain when standby

Hi, I currently have an iphone 5s and every night I experience 50%-60% battery drain every 6hours. Just now, I got 30mins of usage and 8hours and 33mins of standby, and to my surprised I got pissed and tried to solve this issue again.

I do appreciate your suggestions and stuff, but please read what I've done.

? Tried to downgrade from 9.3.3 to 9.3.2
? Reset and backup
? Downgrade to 9.3.2 and set as new iphone.
? Downgrade to 9.3.2 and restore
? Removed all background app refresh
? Tried to airplane mode when sleeping
? Just recently replaced battery
? Followed every advice in the internet.

All these FAILED.

This battery drain is not usual. It just pisses me off to see me struggle everyday.

Thank you I hope I get help. Please and thank you. If replacing the phone would be the best solution, I doubt I can afford. Thank you guys.