S7 Edge batt level inconsistent

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S7 Edge batt level inconsistent

The past few weeks my phone will be at say, 40% and then 2 minutes later I'll get a notification that it's at 13%. I've also had instances where I literally watch it drop from 35.. 32...29..25..etc to 4% and shut off, all in about 7 seconds. I can't tell a difference in general battery life length although the lower level inaccuracy and inconsistency is frequent and annoying. 

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