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Re:All About Batteries by zwieback on Monday September 15, 2014 @12:07PM (#8319655)
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/resource/techni...

Re:All About Batteries by Wingman4l7 on Monday September 15, 2014 @12:34PM (#8319808)
There is also the THINERGY thin-film lithium rechargeable battery, which was used in a prototype super-slim eInk watch on Kickstarter.