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A good page that describes battery theory is here.
Maybe someone with more chemical background then me can show that you could add materials to the battery while it is discharging to "increase" its overall capacity and charge level. I used to live with these equations and drop down for specific gravity readings myself when I was in the Navy but that was a long time ago.
Don't mix lead acid batties and salt water.

A quote:
The speed of light depends on the medium through which the light travels. In empty space, the speed is 186,000 (1.86 X 105) miles per second. It is almost the same in air. In water, it slows down to approximately 140,000 (1.4 X 105) miles per second. In glass, the speed of light is 124,000 (1.24 X 105) miles per second. In other words, the speed of light decreases as the density of the substance through which the light passes increases.

124/186=0.666 0.666*300.000km/s=200,000km/s So it would take 0.10 secs for light to get to any point on earth. That still leaves about 0.1 secs for processing of various sorts.