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So I know you posted that like 5 months ago but... Batteries are actually heavier when they are full. However, light does not have mass. Light is by definition a massless particle. A lot of people think that only things with mass are affected by gravity and because light is affected by gravity (see black holes) then light must have mass, this is wrong. Gravity is about energy and mass has silly amounts of energy (see nuke) and light has much less energy. And because massless particles (like light) always travel at the speed of light (umm..) you can only see light bend around blackholes and large stars.
So basically, light doesn't have mass, but it has energy, and gravity is about energy, not mass.