To expand on what I mean, I checked the voltages of each cell in the battery pack and they each read about 4.0v ea (6 green Li-ion cells in a 11.1v 53WH battery) and the total voltage reads 12.4v.
At this point I'm thinking that the problem lie in how the laptop uses the battery though I'm not sure how to test this.
Once the power cable is unplugged, the laptop will remain on but the built in battery light turns orange. It abruptly shuts down after about 10 minutes so it is using the battery to an extent.
This is a Dell Inspiron 6400.