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I saw this 220um thin battery in an ST update recently, thought that was pretty cool for ultra-low power apps: http://www.st.com/st-web-ui/static/active/en/res

• Wingman4l7 12y ago
  There is also the THINERGY thin-film lithium rechargeable battery, which was used in a prototype super-slim eInk watch on Kickstarter.