Lithium-ion batteries have all but replaced nickel-cadmiums because they're lighter, have a higher energy density, and don't suffer from recharge-inhibiting memory effect. So-called "smart" lithium-ions give feedback to the laptop about their remaining power, so the computer can conserve as necessary.
Two more specs to look for in laptop batteries are capacity (measured in milliamp hours, or mAh), and the number of cells. Typical batteries have a mAh rating between 2,000mAh and 6,000mAh; higher is better. Cells are the actual compartments where power is produced and can range from four to 12; the more the better -- although take in mind this may cause the battery pack to stick out from your laptop in potentially awkward positions.
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