#9 NDBs do exist but they are not yet available and even once they are they have a very limited power output. around 1microwatt you would need about 100 thousand to 10 million of those batteries to power an LED light bulb.
#9 NDBs do exist but they are not yet available and even once they are they have a very limited power output. around 1microwatt you would need about 100 thousand to 10 million of those batteries to power an LED light bulb.