Arduino clock with micro usb how to charge li ion 3.7v?

1

1kvin2016-05-18 19:42:35

Arduino

1kvin, 2016-05-18 19:42:35

There is a clock and you need to charge the li ion battery from the micro usb port. What is the best way to do this without killing the controller?
A piece of the scheme; https://goo.gl/photos/FXsgjE9jrocPzeEBA

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