I have iPhone 6+ and my battery drains pretty fast after I left it on charger 2 nights in a row?

I have the 6+ and the first few times of completely using it, I mean couple days of charging it and what not, I was getting very long battery usages, but a couple days ago I accidentally left my 6+ on the charger over night and ever since then, my battery is draining fast. Like I charged it last night and kept it on, nothing in background, no Wi-Fi, no cellular or anything on. Location settings for only stuff I would want on and only if it gives me the option to have the location on while I use the app not even when i'm not using the app. When I first got my phone I restored from backup, and I read that it's always good to always setup an iPhone from new/ not restore from backup so I restored it and set it up as new hoping that will save my battery from getting messed up. Did I do something wrong? I feel that keeping your phone plugged in overnight damages the battery. It happened with my 5 and now my 6+. Is there anything that I should or could do?

Okay you may have overcharged the battery remove it once **** fully charged

Let me guess you have the screen on all day texting and expect the battery to stay at 100%? Lol

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