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Originally Posted by theducks
That Battery Voltage sounds high. Most device batteries are 3.7
That was almost the full 5V of the USB port (after voltage drops)
Was the charger attached?
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Most 3.7v LiPo batteries are actually 4.2v with no load. Even one of the kindle batteries I disassembled said 4.2v on the inner battery back, though the amazon label said 3.7v.
Quote:
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Lithium ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light and powerful. The output ranges from 4.2V when completely charged to 3.7V. ... The included protection circuitry keeps the battery voltage from going too high (over-charging) or low (over-use) which means that the battery will cut-out when completely dead at 3.0V.
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So in reality, 4.08v is not even a full charge. 3.7v is just a "nominal" voltage, sort of a typical midrange voltage for its full operating range.