Why does my iphone 4s verizon shut off when at 20%?

I use to have the 4s at&t one and it would last until 1% so now shutting off at 20% is really annoying. I'm just curious why it does it on verizon & not at&t. I charge it the same as i always do my iphones. I searched the web & came up with nothing but yet to have to contact verizon but i just thought i asked the community first since they know more than these businesses nowadays.anyone know y or has same issue or how to fix?

Defect.

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