MoofishMan
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Battery Power for Portable Pi

Thu Oct 03, 2013 1:20 pm

Hey guys...I'm a newbie here in Pi-land, as I got my first one last month...my goal for it is to build a little portable PC that is too big to be a smartphone and too small to be a laptop (I've already got a 3.5 inch monitor and one of those little wireless keyboard/trackpad things). Problem is, I'm a little stuck as to which battery power source to buy, and wiring is a bit of a hassle, too. Could someone help me out by telling me what kind of battery I'll need to run everything, as well as how to wire it with minimal soldering?

It might help if I give you some specs:

Monitor: 3.5 inches, LCD, box says it needs 12 volts, I have yet to see how low it can go.
Pi: 5 volts, although I'm running it off of my Dad's 4.8 volt charger and it works fine with the monitor (switch to HDMI and it freezes up). The pi has a wireless dongle for the keypad, too, so a little more voltage may be appreciated.

I do hope to use a USB hub, too, that may need to be powered as well.

If anyone can help me, that would be greatly appreciated!!! :D

- MoofishMan
Last edited by MoofishMan on Fri Oct 04, 2013 2:15 pm, edited 1 time in total.

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Tage
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Location: St Thomas, Ontario Canada

Re: Battery Power for Portable Pi

Fri Oct 04, 2013 1:13 am

I would use any 12V battery and buy one of those gadgets that plug into the cigarette lighter and provide 5V at 1A or more to a USB connector. I usually open the gadget and throw away the enclosure and other unnecessary stuff and use only the circuit board. the cost is only a few dollars. you can even adjust the 5V to 5.1V to get more margin that is badly needed because of the strange poly fuse.

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AndrewS
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Re: Battery Power for Portable Pi

Fri Oct 04, 2013 3:46 am

http://www.skpang.co.uk/blog/archives/541

And I'm sure there's loads of other examples if you search for them. I've seen a few links to similar projects on instructables.com for example.

amphibian
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Joined: Sat Sep 07, 2013 7:07 pm

Re: Battery Power for Portable Pi

Fri Oct 04, 2013 4:47 am

I would check this out for assistance....

http://blog.parts-people.com/2012/12/20 ... rpi-to-go/

and the video here.....
http://www.youtube.com/watch?v=E89s2h9swIc

fixitsan
Posts: 58
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Re: Battery Power for Portable Pi

Fri Oct 04, 2013 7:36 am

Same topic came up here
http://www.raspberrypi.org/phpBB3/viewt ... 91&t=56825

The bottom line is that it's better to use switch mode supplies rather than resistive droppers or linear regulators.

The RC battery packs in the range of 7V-10V are readily available, cheap, in a variety of capacities

Whig
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Re: Battery Power for Portable Pi

Fri Oct 04, 2013 8:32 am

Tage wrote:I would use any 12V battery and buy one of those gadgets that plug into the cigarette lighter and provide 5V at 1A or more to a USB connector.
I'm working with my battery powered Raspberry Pi project and I was going to use those too but then I found something better.
This kind of things: http://www.current-logic.com/shop/index ... 9b87ab1951

That is not exactly same kind what I'm using but it also has two wires in USB out... and works perfectly.
--
My projects and other stuff: http://www.petrilopia.net/

MoofishMan
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Re: Battery Power for Portable Pi

Fri Oct 04, 2013 11:32 am

Thanks guys...I'll check out those links then I get a chance :)

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MattHawkinsUK
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Re: Battery Power for Portable Pi

Fri Oct 04, 2013 11:35 am

I would be worried about the strange current claims of that device. "3A" output but not actually really "3A". What is it? 1A? 200mAh? They seem confused.

If it can't charge a phone then I wouldn't try running a Pi from it.
My Raspberry Pi blog and home of the BerryClip Add-on board : http://www.raspberrypi-spy.co.uk/
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MoofishMan
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Location: Somewhere

Re: Battery Power for Portable Pi

Fri Oct 04, 2013 2:12 pm

I should clarify: The cell phone charger handles the cell phone okay, but its a little underpowered for the pi.

MoofishMan
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Location: Somewhere

Re: Battery Power for Portable Pi

Fri Oct 04, 2013 2:13 pm

Oops, I was looking back over my posts and I just noticed that I had said the monitor was VGA - its actually LCD, and it uses RCA (I get all these 3-letter terms mixed up :P)

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