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CHAPTER Energy in the small: Integrated micro-scale energy sources CHAPTER OUTLINE 2 Introduction .......................................................................................................................................... 15 Electrochemical energy: Fundamentals of galvanic cells and supercapacitors .......................................... 17 Energy stored in the galvanic cell .............................................................................................18 Power delivery by a galvanic cell ..............................................................................................19 Current status of miniature galvanic cells..................................................................................19 Miniature biofuel cells.............................................................................................................21 Remarks on biocompatibility ....................................................................................................22 Miniature supercapacitors........................................................................................................23 Miniature supercapacitors: Discussion on the status and research needs ..................................... 27