close as in almost touching but not inserted.
In: Engineering
The voltage on a USB charger is only 4.2 volts and a max of 2.1 amps. This is extremely low lower and unless released quickly with a capacitor will not really spark.
Small electronics, by design, operate on a tiny bit of power, most of it going to the screen. The batteries can get very hot and burn even but to get a spark your need quite a bit more voltage.
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