Canon said it has <A HREF="http://news.yahoo.com/s/nm/20051025/tc_nm/japan_canon_dc">developed tiny fuel cells</A> that it hopes will start replacing conventional batteries to power some of its digital cameras and printers in three years. Canon will join a small army of companies, including Toshiba, NEC, and Hitachi, that are working on the development and commercialization of fuel-cell batteries for the next-generation of consumer electronics. Fuel-cell technology mixes hydrogen and oxygen to generate electricity and is considered a promising replacement for today's lithium-ion batteries, which are widely used to power a range of mobile products from notebook PCs to mobile phones.