Try using different usb ports on your computer. All usb ports carry 5 volts. Not all carry enough current to charge your battery. If that doesn't work try a different cord. If that doesn't work look for debris or bent pins in your charging port. Remove any debris if found. If you find bent pins there is a replacement here. The replacement part requires soldering. If everything has checked out to be in good order so far. Your battery may have drained during the repair down time. You may need to check the voltage of your battery with a multimeter that can test for DC volts, my understanding is the computer may not recognize it if the voltage is under 3 volts. This thread here will explain how to solve that problem. If none of the previously mentioned solve your problem check the charging dock connection to the motherboard, as well as the other connections. Instructions for removing the motherboard are here.