cool, just fyi 10 bit adc @ 100v will give you about 0.1v resolution at the top of the pack, then you have to subtract out the lower voltage readings to get the individual voltage which create rounding errors on the "higher up" batteries, with 6 batteries it won't be a big deal though.
Also, you can use createChars to make 6 mini bargraphs (speaking of rounding errors
) on the display, one for each battery, from zero pixels to 8 pixels high (blank and full are already existing characters probably, maybe even 1 pixel high already exists), or expand them to 4 lines high. Lucky you have 8 ADC and 6 batteries!