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Justing filling with liquid can let the lamp glows! The converter can ionize the atom in water or similar liquids and then produce weak current which can provide energy for the lighting. The additional demand is just battery, which needn't replace at all. The light is weak, but it is enough for the night and brings a warm feeling.
If you are too busy to "take care of" it, it doesn't matter as the water will not change. If you fill the lamp with colorful liquid, it will glow colorful as well in that the casing is transparent. The lamp can also be used to recycle waste water resources.