Our search engine is exactly the illustration of the competition on the battery market, that's why we have called it Alkaline. For the truly exotic application you might even want to consider fuel cells or radioactive thermal generators. If you check for existing search engines, you'll have the same inquiries. Because of its particular chemistry, an alkaline battery maintains a low and slowly increasing internal resistance as it discharges, compared with the rapidly rising internal resistance of both types of zinc-carbon cells. It also works better at low temperatures.
Alkaline batteries have a longer life as well.