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Here is the single celllion battery indicator.

this indicator will show the status - low as red & usable voltage as green.

This instructable can also compatible with 4V - 4.5V Lead Acid Batteries.
What about power consumption?
<p>can we use sc338 npn transistor</p>
<p>why is your circuit board in the shape of an Oklahoma? </p>
<p>just to fit in my project !</p>
You didn't hear? Its the lithium Ion State.

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