Extended laptop battery

[jeff3864]

I recently bought a sager np7339, and since i am going to remove the 1tb hdd and only use the 2 msata slots i was thinking on what i could use that extra space for. It occurred to me that aaa batteries would fit in that slot (13 to be exact) and I was wondering if anyone might have some information on how feasible it would be to hook up rechargeable aaa batteries (either standard sanyo eneloops at 1.2volt or some lipo aaa size batteries at 3.6ish volts). Would it be better to hook them up for 11 ish volts (the sager batteries rating) and put them in parallel with the main battery, or wire  them for 20volts and put them on the other side of the charging circuits (im assuming software would tell me that my laptop was always charging if i went this route.

[Timopomer]

that would be a bad idea imo