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According to the surveys, world consumption of primary battery is about 35 billion. Different
size electronic devices need matching size batteries. Size mismatch is one big problem when
we use batteries. AAA battery and AA battery have same voltage output which means they
can replace each other. But now people need to buy twice the number of batteries just because
size mismatch. So we design a battery adapter made of recycle-paper that can change
the size of AAA battery into the size AA battery.