>>114265241Rechargeable batteries have their initial charge because the materials used to make them have embodied chemical energy, which was put into them when they were processed from raw materials. This energy typically comes from petrochemicals or electricity from power plants. Gems emerge fully-formed and active from underground, which not only has no access to sunlight, but virtually no local redox potential to derive energy from. Even if Gems can use sunlight, that's obviously not their only or even primary power source.
