pocket juice question


Keith S
 

Hi, anyone familiar with "pocket  juice" devices, those that are basically portable battery packs that allow a user to charge a cell phone or VR stream while away from an AC outlet, I have a question.
 
Do these devices automatically start charging the device in question when plugged into the phone  or stream, or do you have to push a button or flip a switch to start the charge?
 
Thanks
 
Keith

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