I would recommend trying to let the battery charger sit and charge the laptop for a while, also you could try a different battery charger, and I also recommend trying different outlets in your home. Sometimes if a power supply goes bad, it could potentially not supply enough, Volts, or Amps, which in turn would prevent the power supply from giving enough Watts to the battery in order to charge it.
Troubleshooting something like this calls for a process of elimination, meaning that as you troubleshoot we are going to cross things off that could potentially be the problem.
Based on what you have described, I would like to assume these as possible issues:
* Bad Power supply (Most Likely)
* Bad battery (Likely)
* Bad motherboard (Least Likely)