Gravity isn't the storage mechanism; the ballast bag is. Gravity is the mechanism used to unleash the stored energy, the same way that the electro-chemical voltage difference between the two components of the battery is the mechanism that unleashes the stored energy in the battery. If anything, it's a ballast-bag-powered light.
I'd say you have the most accurate description of when they say "Gravity Powered". While lifting this thing, the energy gets stored and gravity is just a means by which the stored energy is released.
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Gravity is the storage mechanism. When someone says something is battery-powered, do you start an argument about how that technically isn't correct?
Probably yes. Annoying pendants are predictably annoying.
I think you mean "pedants". ;-)
http://en.wikipedia.org/wiki/Muphry%27s_law
Perhaps he was talking about a particularly obnoxious piece of jewelry.
Gravity isn't the storage mechanism; the ballast bag is. Gravity is the mechanism used to unleash the stored energy, the same way that the electro-chemical voltage difference between the two components of the battery is the mechanism that unleashes the stored energy in the battery. If anything, it's a ballast-bag-powered light.
I'd say you have the most accurate description of when they say "Gravity Powered". While lifting this thing, the energy gets stored and gravity is just a means by which the stored energy is released.