 Firsts units of this model originally came with a Ni-MH battery pack, while later ones came with a more dependable Li-Ion one.Both types were available for purchase, and obviously they fitted in all of the 1200-series.One interesting thing about this specific model is its support for Pentium III processors up to 1Ghz, but only for Coppermine cores and at the expense of massive heat & battery power draw increase.