Detect whether it is the fault of Battery or charger using compatible notebook battery and chargers(Same voltage and size);
Make sure all cables are properly connected;
Make sure the battery for battery is not dying, Lithium ion battery has limited battery charge-discharge cycles of 500 times also, Getting our cheap replacement battery save your time and money a lot.
If you want to get a new battery, then I suggest http://www.battery4us.com .
There are newer li-ion cells that have been developed that retain 70% of there charge even after 500 charges. The cells are made by Panasonic (NNP type) and also have very high capacities as well 5800 mAh vs 4400 mAh for the same 6 cell laptop battery. Its a win win and is an upgrade for most laptops that have poor battery life. Some examples of these advanced laptop batteries are at http://www.SafeBatteries.com