A full charge of the battery does not mean it does not have any more battery cells that can be charged.
The Lithium ions inside the lithium cobalt oxide layer are designed by manufacturers so that only half of it is used, to ensure repeat charging and discharging for maximum cycles
A new wearable device turns the touch of a finger into a source of power for small electronics and sensors. Engineers at the University of California San Diego developed a thin, flexible strip that can be worn on a fingertip and generate small amounts of electricity when a person's finger sweats or presses on it.
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