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car battery
you put in one type, leave it on over say 4 hours, VIDEO TAPE the whole thing, check when it went out, then do the same for the next type.
Duracell and Energizer. wat type of battery is thiscar battery 068113144107
methane
The current leader in energy density and life is lithium chemistry batteries. If you can't get that, go for Alkaline.
probably fresh water or salt
A battery is the electrochemical cell is used as an energy source in a flashlight.
electrical energy
A flashlight is an example of a series circuit; a battery in series with a switch in series with a bulb.
AA energizer
it depends on the battery and how much you use the flashlight
Severe thunderstorms.