I just got a libre, charged it. I read about 45 minutes daily and the device stays on its sleep phase (the one that opens up right away when you push the power button, so its not really off) and after 12 days only the last bar (out of three) is still lit. Battery will not be dead for a while but I just decide to charge it then (3 hours) since I heard that you can get some funky things happen if you let the battery die completely out). Hope this helps.
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