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electronicNerd NO!!!, A fully charged Lithium-cell is 4.25 volt! Further more, when it's half discharged the voltage will drop below 3.6 volt. Fully discharged a Lithium-cell will drop to 2.5 volt. You will have to make a constant-current controller and limit the CURRENT to max. 6-700mA! Do not think about voltage just be sure it is sufficient high to drive the current-controller. A simple current contoller can be made with 4 components, a transistor (that can handle the current), 2 resistors and a small red LED with a voltage-drop as low as 0.5 volt :-) :-)
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