Can't a mobile phone operate on a lower battery voltage in order to extend the battery run time? - Quora
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How does a smartphone control the battery voltage? - Quora
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Voltage and current profiles for batteries from (a) the new smartphone... | Download Scientific Diagram
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Applied Sciences | Free Full-Text | A Smart High-Voltage Cell Detecting and Equalizing Circuit for LiFePO4 Batteries in Electric Vehicles | HTML
Why Your Phone Dies When It Claims to Have Battery Left | Wirecutter