Help I'm wondering how I can find the true reason why I'm losing battery so fast today (see image)

[S7 battery Question]

No new update or apps and my phone is losing battery extremely fast today. I feel the stock battery monitor doesn't tell me anything useful so I was wondering if there is a way to find the true cause?

Here is a screenshot: https://goo.gl/photos/eGBWpXyBtP1k5oUC6

 

[Slug]

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