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The Z930's internal 'honeycomb' design helps to achieve its low weight, although the magnesium alloy chassis clearly also has a part to play. There are also a couple of slight weight-saving design elements in the general build with battery such as Dell FK890 Battery , Dell FT080 Battery , Dell G2053A01 Battery , Dell G5226 Battery , Dell G5266 Battery , Dell G5345 Battery , Dell GD761 Battery , Dell GG386 Battery , Dell GK479 Battery , Dell GR986 Battery , Dell GR995 Battery , Dell GW240 Battery . The lid section wraps around the hinges, while the base is recessed along its left and right edges where the keyboard sits. Both are nice design features that also shave a few grams off the overall weight.