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PostPosted: Fri Feb 03, 2017 10:04 am 
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Location: Colorado USA
I recently picked up a portable TV set with composite video input and I plan on playing NES with it on a plane. Could I power my NES with a 9-Volt battery?


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PostPosted: Fri Feb 03, 2017 10:17 am 
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viewtopic.php?f=9&t=1210

Surely there are better ways to play NES games on the go, specially nowadays.


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PostPosted: Fri Feb 03, 2017 10:21 am 
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I think you'd have a hard time finding a battery that can last long enough. Maybe one of those large high capacity 9V batteries could last a little while, but they might not like that kind of thing in your carry-on luggage.


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PostPosted: Fri Feb 03, 2017 11:11 am 
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Conveniently, you can look up battery discharge curves from the various manufacturers.

The NES takes about 400mA, although any given cartridge will add something to that.

This is so much higher than any 9V battery is capable of, it's not going to turn out well.
9V batteries have astoundingly high parasitic resistances (because they're made of stacks of six AAAA batteries).

Extrapolating from the graphs available from Energizer:
* Eveready 1222, Energizer 522 - about an hour
* Energizer L522 - about 2 hours
* rechargeable NH22 - maybe as little as 20 minutes

If you really want a portable NES ... use a LiIon battery pack. And bypass the 5V regulator. (do NOT bypass the 5V regulator unless you're only delivering 5V to the NES logic board)


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PostPosted: Fri Feb 03, 2017 12:26 pm 
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The TSA will surely let you carry something like this onto a plane :lol:

Image


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PostPosted: Fri Feb 03, 2017 12:51 pm 
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I didn't say build the LiIon battery back. :P

You can get surprisingly big LiIon battery packs that produce regulated 5V, e.g. https://amzn.com/B005X1Y7I2


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PostPosted: Fri Feb 03, 2017 1:34 pm 
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But then you have to open the NES and make modifications, don't you? Most people aren't willing to do that. The 9V battery approach is interesting because of the simplicity of the idea, anyone can set it up in 2 minutes.


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PostPosted: Sat Feb 04, 2017 3:10 am 
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5x D cells is a lot nicer idea. 7805 will waste minimal amount of power then too. Or 3x of them straight to 5V, the machine will run for quite a few hours before the batteries run out, you will have a bit darker image due to 4.5V vs 5V difference and by the end of life there will be graphical glitches and eventually things stop working proper lol.

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PostPosted: Mon Feb 06, 2017 2:07 am 
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Powering an NES on a commercial airplane is on the same level of stupid as Thomas Edison bringing nitroglycerin on a passenger train.


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PostPosted: Tue Feb 07, 2017 12:02 pm 
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Just throwing this out: I love my Retro Duo Portable 2.0. Not only does it play NES/SNES/Game Boy/Sega/Game Boy Advance, but it supports 2 SNES controllers and can hook up to a TV that still has RCA cords. All this and one less reason for the TSA to beat me down/cavity search me for having a battery with weird wires coming out of it.


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