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So I would like to have a laptop-esque setup with my rpi. I have my pi, my keyboard, and I want to buy a small USB monitor along with an external battery pack with USB ports. My question is to make this portable can I power a powered USB hub along with the rpi and USB only monitor off this battery. If not is there anyway I could do this with something else?

Thanks, and here's a link to the pack.

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You should check this out: youtube.com/watch?v=yZkz_a52I6s – XAleXOwnZX Nov 12 '12 at 5:40
possible duplicate of How do I build a UPS-like - battery backup - system? – ppumkin Nov 12 '12 at 9:46
You don't say what sized battery you mean by portable but you can get in-car 12v to USB adapters... cut the accessory plug off, and add two croc clips or crimps – Andrew Nov 13 '12 at 8:59

1 Answer

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It should be possible with nearly any USB-battery-bank. What you need to calculate is the runtime you can get with such battery. The RasPI (Model B) normally consumes about 600-700mA. With the battery mentioned by you it's about 15h runtime without any accessories. Check the comsumtion of your USB monitor. A quick search on google gave me one that consumes up to 9W (1800mAh @5Volts). Given that and 250mAh for mouse and keyboard, your runtime would be around 4h. Check if this would fit your needs.

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You can increase the battery life by down clocking the Pi to 500mhz - Then it will never get close to 600ma. Use a suitably selected battery- not just any alkaline. For example rechargeable sanyo Eneloop /Eneloop XX or some other Lithium battery backs like used in Mobile phones. – ppumkin Nov 12 '12 at 9:50
I don't think the problem in this case is the PI... It's definitly the monitor. – Mose Nov 12 '12 at 9:57
Yea that is true. He would have to use a LED screen instead that is much more efficient than the USB screens designed for AC powered devices. – ppumkin Nov 12 '12 at 10:14

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