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You can add 2 extra AAAs to your car by just adding another link in the battery holder chain that is the harness. The negative from one goes to the positive on the next, etc. The lithium upgrade either requires you getting 4 AAA lith-ions (only one place has them that I currently know of), which may actually be too much voltage, or 2 AAs, which is much more common, as they lighten the car.
However, with the 6 cell, you're getting 50% more voltage, and with the lith-ion, your getting a lot as well, and you risk frying the FETs (the small black chips on the control board that take small on/off signals and use them to turn on the much bigger power connection between the motor and the battery). Solutions: 1) stacked fets, whereby you solder another pair on top of the originals, sharing the workload, 2) external turbo whereby the FETs are offloaded to an external board, allowing more MUCH higher voltages (I'll melt wires before I melt my board or turbo), and sometimes sending regulated 5V power back to the control board. The good thing here is that the steering servo is getting 5 volts instead of the regular 6, so it jitters less, while the much higher power still gets fed to the motors.
BTW: Make sure if you go lith, to get lithium-ION, and not just lithiums, as the regular liths are not rechargeable.
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