Open Waters - The Open Source Boat Wiki
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http://www.combro.co.uk/nigelh/diver/tank.html

http://cair.wikia.com/wiki/Main_Page

11liter scuba tank can hold 1242000 joules of energy at 230 bar. This is 345watt hours. This equates to USB at full power runs at 5v 0.5amp 2.5 watt

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