How to choose a led and the battery?

there is such a wonderful ashtray from me:

31u-CpruJUL.jpg

want inside the double-sided tape to stick a yellow/orange led.
how much are looking for, they all 12 volt or "standard", with standard no description voltages.
I need to make it compact, therefore it is battery - "tablet" like on the motherboard.

question: what led to choose and how? or I don't understand something and you can't do that?
September 26th 19 at 11:39
1 answer
September 26th 19 at 11:41
Google the name and count all that is needed.

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