Datasheet

Connected Mode (UART)
The following measurements illustrate the average current draw in connected mode (with the connected LED enabled). UART mode was used as
a test case.
Average Current: 1.86mA
Peak Current: 15.2mA
Expected Battery Life: 645 hours (~26.8 days)
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https://learn.adafruit.com/introducing-the-adafruit-bluefruit-le-uart-
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