Biggest Power Bank Yet!

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This is the big daddy of power banks! 21 18650 cells so the equivalent of 3.5 laptop batteries. Somewhere in the region of 200Wh give-or-take as the cells are used.

This one is the easiest to use, spring contacts and a sliding lid. It supports fast charging both in and out at 5, 9 and 12 volts and has a range of USB connections as well as an Apple one.

I fully charged it about a week ago and it is showing 96% currently which would indicate 1 or 2 cells cross-charging. When it hits 90% I'll test each cell, identify the weak ones and replace.

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