Hi I am doing a science project for school on the longest lasting battery. I am testing Duracell Coppertop, Energizer Ultimate Lithium, Eveready SUPER HEAVY DUTY, and Panasonic batteries. Congradulations, because Duracell Coppertop is shining the brightest so far. The others are slowly dying, but your brand is strong and is persevering the constant running of the flashlight.
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