I just ordered the Studio 15 that was almost $500 off, total was less than $1500 which was amazing. I didn't have the option though of choosing a 6-cell battery. I prefer the laptop to sit flat instead of having extra battery and being unconfortable as I have it on my lap a lot. I was under the impression all 9-cell batteries had a buldge in them, is this true? Or will the 9-cell for this model sit flat when the laptop is on an even surface. Thanks!