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Hello sir, my name is ***** ***** I would love to help, to answer your question we would need the wattage of the bulb.
you must achieve at least 2 amps for the bulb to work. There are 12v battery options with the required amperage available for a single battery to be used, or you can use multiple smaller batteries to do the same work..like in a flashlight..
however the bulb should light, even if very dim, with considerably less than 2 amps
are you expecting the bulb to light to full brightness? or just to begin to glow?
another consideration is how long you would light it to work?
like it to work*
Something like this would light the bulb for about 15 minutes at full brightness and 30 ish minutes at half brightness.
and its rechargeable :)
finally, incandescent bulbs efficiency goes down at lower temperatures. So, even though you are using less total power you probably wont see the 30 minutes at half.
you can go smaller, but the times will decrease accordingly.
I hope I have been helpful in this matter, if you have any further questions i am still here. If you have a moment, please rate me so the higher ups know i am doing a good job ;)
If there are any other questions you may have i am still here to help,we can go in depth to an exact amount of time you would like your bulb to work, if you take a second to rate my service i would really appreciate it.