I keep time with a 3.3v coin battery on board battery connector. Set time for software and then sync clock to hardware. For safety and convenience, I keep it on a holder plugged in a very small blue breadboard and blue/white male-female jumper wires... Adds to the look. Image may be NSFW.
Clik here to view. PS: I don't really exactly know know about the current draw when asleep, but since the end of December, it keeps the time .
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Re: Galileo rtc wake-up possibilities ?
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