In this tutorial you‘ll learn how you can use eSATA/USB port available on your laptop to charge smartphone using USB data cable even when laptop is power off.
Sometimes your smartphone battery drained out or your iPod battery is drained out and AC power source is not available or AC travel charger is not available. In such situation, you can use you laptop to charge phone or other device of course via USB data cable. But what if you do not want to turn on your laptop to charge your phone.
How to Charge Smartphone even When Laptop is Shut Down:
It’s possible to charge your phone or any other USB device using your laptop even when your laptop is shut down provided that your laptop supports it. That is, not all laptops send power to USB ports when they are turned off. The feature drains out the battery if a device is left connected to the laptop even after turning off the laptop.
If your laptop supports the feature, one or more USB ports on the laptop will continue to get power even after the laptop is turned off. There might be an icon next the USB port to indicate that the USB port gets power even when the laptop is shut down. For instance, my ThinkPad 450s has a battery icon next to one of the USB ports on the left-side to indicate that it gets power even when the laptop is not running.
If none of the USB ports on the laptop gets power when it’s turned off, please check your BIOS setting as usually there is a setting in the BIOS to turn this feature on and off. You can also check your laptop’s user manual or contact the manufacturer to check if your laptop sends power to its USB ports when it’s not running.