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USB POWER BANK // PORTABLE POWER SUPPLY

Former Member

Hi, I got me a raspberry pi 2 model B with UK power standards. Have anyone power this device with a usb power bank that is for charging a smartphone?

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  • 0

     

    Greg Fenton: will it work? Im no electrician but the vilros adapter indicate outputs 2.0 DC current and MaH is another thing that I don’t know about.

     

    Wow roger I had that kind of thought well a lot hehe.. one of em is where that batteries of an AA that is packed like the RC car batteries as a jump start to boot the pi2 for several minutes or so, then a usb hook up to that battery, kinda like how smartphones are powered while charging, but I don’t know how to accomplish that hehe, but watching from youtube about using a USB powerbank most of it are on pi1.

     

    Im trying to get this approach which is spot on! I want to do this with my pi2mB

     

    https://www.youtube.com/watch?v=6nh11axTXQo

     

    From Pi1 user manual it is stated possible and etc to use a USB mobile charger and models varies in mAh. All videos I found are all on pi1

     

    For one on using powerbank is this

     

    https://www.youtube.com/watch?v=x5e9woT5pEQ

     

    But from pi 2 model b manual out of the box state that it is not designed to be powered from a USB port on other connected equipment, that it may result in malfunction and from Vilros manual requires a power supply of 5V providing atleast 700ma similar to pi1 manual

     

    What worries me the most pi1 is somewhat 1st Gen and in still on a testing phase just like PSP back in the days haha pardon me if im out of topic, and pi2mb is smaller in size with new features and has a separate RAM which I think voltage circuitry is tweaked out of the factory, buuuut it has a protection circuit when powered from the micro usb port..

     

    If only there’s some vid on pi2mb using a powerbank will push me forward on my next thing plus I got this habit of burning my mod which scared me lol

     

  • 0 in reply to Former Member

    What the pi2 manual tries to say is that powering the Pi (1 or two doesn't matter) from a normal USB port on your PC is not recommended.

     

    The 'pi will use  up to 700mA which is over the maximum or 500mA that USB ports should be able to provide. And because the data lines of the raspberry pi power-port are not connected, a PC should actually limit the current to about 100mA and that's definitively not enough for a pi. Normal USB devices then request: "may I have more than 100mA?"  to which the PC replies: sure, go ahead! But in practice, most PCs will just provide 500mA or more even before the device has asked for more than 100mA.

     

    All this does not apply to "chargers" that are clearly marked 1A or more.

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  • 0 in reply to Former Member

    What the pi2 manual tries to say is that powering the Pi (1 or two doesn't matter) from a normal USB port on your PC is not recommended.

     

    The 'pi will use  up to 700mA which is over the maximum or 500mA that USB ports should be able to provide. And because the data lines of the raspberry pi power-port are not connected, a PC should actually limit the current to about 100mA and that's definitively not enough for a pi. Normal USB devices then request: "may I have more than 100mA?"  to which the PC replies: sure, go ahead! But in practice, most PCs will just provide 500mA or more even before the device has asked for more than 100mA.

     

    All this does not apply to "chargers" that are clearly marked 1A or more.

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