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Mobile Device Charging
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Engadget
No charger, no problem: The best ways to charge your phone away from an outlet
This guide explains how to charge your phone without a traditional wall charger. It emphasizes that as long as you have a USB cable and a power source, such as a power bank or a computer, you can keep your device charged on the go.
Engadget
Does charging your phone in your car waste gas?
Charging a mobile phone in a car uses a negligible amount of energy and has no significant impact on fuel consumption. The energy draw from a phone charger is minimal compared to the overall energy demands of a running vehicle.