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- [Voiceover] In order to light the blue LED, I need to construct a battery that generates more power. Whereas a 4-cell battery was enough to light the red one, I needed to make a stronger battery for my blue LED. So I made a battery made of six cells. So there are six sanded pennies, six soaked matte boards, and one intact penny on top. This battery generates over three volts, and so when I attach my blue LED, now it's powerful enough to light the blue light.