Why does my iphone take so long to turn on while charging?

I have the IPhone 4s, and I have had it for almost 2 years now and i have an upgrade in September but i have a lot of problems right now. My phone dies CONSTANTLY. It dies at 60, 70, 80, 90, even 100% sometimes & on the rare occasions when it does die at a low percentage, it can take anywhere from 2-9 hours to turn on. I just wanted to know if there was a way i can get my IPhone to turn on while charging, I really need help, this happens to much and I'll try anything!

I never shut mine off ever, not while charging either.

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