Tube Battery — part 2

This is my ‘Tube Battery’ with an aluminum foil anode instead of a magnesium rod. The cathode is the same non-magnetic stainless steel tube from a dollar store solar garden light. The electrolyte is sea salt and bottled drinking water. I think what I made here is a type of aluminum / air battery. Not knowing the exact chemistry of the stainless steel tube makes it hard to determine exactly what it is. It will except a charge from a 3.7v source. Resting voltage on the cell is only .25v but when charged will hold 1.2v and pump out about 15mA. The ions are have a wild party inside the tube but I don’t know what song they are dancing to.
Here is the definition of an aluminum-air battery but I don’t know if this is what I have built:

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