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When you try to take batteries out of something, it is often difficult because they are made to stay in place and not fall out. This is efficient, but difficult when you are trying to replace the batteries. Easy tik solves this problem. With a piece of sticker on the cylinder of the battery, you can simply pull on the sticker instead of wedging your finger between a small space.
Kookmin universty
Seoul, South Korea
Bang jun mo, You In sik (Kookmin univ), Lee Min woo(Sejong univ), kim Jun se(Seoul national university of technology)