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ONickel Metal Hydride (NiMh) - Popular battery about 1-2 years ago. They are lighter than Nickel Cadmium batteries, but heavier than ontario cobalt. These should be cycled once in a while for optimum performance.
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Li-ion Batteries last longer and charge quickly. A Li-ion battery and a quick charger make it possible to work all day with a cordless drill without stopping.
Power tools that run on Lithium-ion batteries work efficiently in colder temperatures. So you don't have to worry about your battery power tools malfunctioning in the cold! Tool manufacturers like Iskra and Makita are always trying to develop sleek, smaller, lighter-weight cordless tools. Power battery tools tend me more expensive that other powered tools so consider all your options before buying one.