I mean, one of the three LEDs lights up, but no sound plays, no other leds are on and generally, the code is not used.
It works PERFECTLY when connected to USB, but I want this to be portable.
Please Help.
Is that by any chance a PP3 battery in your diagram ?
If so it probably can't supply enough current to run the project, or at lease not for long enough to be useful
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yup. Would it be better if I used 4x 3 volt batteries? Like the flat ones? How do I power this?
Use a powerbank.
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that is sadly too big 
I really only have a cylindrical space 2 cm in diameter and 5cm long.
Coin cells won't do either.
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well that sucks. Any ideas that could fit into the thing? The round handle can fit something 2cm wide and 5cm long, I really don't have that much space 
Two of these (in series)?
(Charger Not Included.)
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That is amazing! While this particular model doesn't fit, it gave me an idea^^ Thank you :3
What is the idea?
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finding a different battery.
Alternatively, I might also try 4 AAA batteries...even though they prolly won't work....I just got them on hand.
Most li-po batteries are only 3.7V. You can get "2S" li-po batteries with 7.2V output, but I don't know if they would be small enough.
They will work fine, electrically, but they won't fit inside your handle.
Li-ion batteries come in a variety of sizes. For example 18500 which would be perfect for your handle. However, these batteries can be dangerous, can explode and catch fire if not used properly. So it's very important to include a protection circuit in your project to prevent over-discharge, over-current, short circuit etc. You can get protection modules in a variety of sizes also.
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The Every has the DC-DC converter (not the linear reg).
7.4V (LiPo) will be good.
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just tested out the aaa.
4 won't fit, but 3 will and they do so just fine, I even found a nice battery holder for them.
They might not last, but they are more than good enough.
The 18500 is probably not yet for me, but in a future project I will come back to it.
You and all others here have been incredibly helpful^^
Thank you^^
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Alkaline batteries are the most easy to use 
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An AAA Alkaline will be around 1.55v when new and down to around 1.2V when half used.
Is 3.6V enough to power the 5V Nano ?
Lithium AAAs on the other hand are good to 1.5v until almost flat. Work down to -40C too.
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I will be careful to find the specific ones.
but 3,6 to 4,5 v is enough. I tested it with almost dead batteries and it worked.
At such low voltages is the processor within specification for the clock frequency in use ?
Unless BOD was altered, undervoltage will be taken care of.
The battery noted by @runaway_pancake is half the thickness of the 9v and as long and wide as the Nano (not much longer than the 9v). They are found in rechargeable bicycle/blinking lights.