Why won't my iPhone 4s charge properly after ios9 update?

I updated my iphone4s to ios9 a few days ago and ever since then, it hasn't been charging properly. I'll plug it in and it'll go up to 80 percent and it won't go past that. I've had it plugged in all afternoon (about 8 plus hrs already) and it's still at 80 percent. Is there a way I can fix it? Is it because of ios9?

4s iPhones don't do too well on iOS 9, sorry to tell you, they have random issues.

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