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What is a "Smart" / "Intelligent" battery?
By: tanch, Wed Aug 1st, 2007
"Smart" / "Intelligent" batteries have internal circuit boards with smart chips which allow them to communicate with the notebook and thus better monitor battery performance, output voltage and temperature. Smart batteries will generally run 15% longer due to their increased efficiency and also give the computer much more accurate "fuel gauge" capabilities to determine how much battery running time is left before the next recharge is required.
from:www.cheap-laptop-batteries.com