Lithium disapointment
The 3 volt lithium battery has proven ok to drive the CPU but two of them in serie does not have a low enough inner resistance to drive the display.
It needs some 140 mA which I thought would be no problem.
When going through the data sheets I found I realize I need to find another solution.
Perhaps I will go back to a step up converter from 3 to 5 volts.
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