If your iPhone 4S doesn't want to register a charger is plugged in, the dock connector may be defective or damaged. This can commonly occur from using third party charges that are poor quality or just from old age. If you're out of warranty and aren't yet eligible for an upgrade with your carrier, a new iPhone can be costly. A DIY repair to replace the dock connector will cost you far less and you'll most likely get a lot more life out of your iPhone 4S.
Follow along and we'll walk you through from buying the parts to performing the repair yourself.