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For what it may be worth, the eInk tags in the local shops use a 2450 coin cell. I had fun in a Walmart when one of the staff was trying to update a price and it didn't change. My suggestion was that he try swapping the battery with another tag since the display wouldn't change with a dead battery. When he did, the price changed. Along with a lot of people, he hadn't realized the eInk tag only needed power to change the display so when they didn't update, the procedure was to swap it out and ship it to corporate.
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