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Is it possible/save to charge a 3.7V Li-ion Battery with a 5V battery charger like this one: https://www.amazon.de/gp/product/B0191EVW0C/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Additional question: Would this be sufficient for an Arduino Pro Mini 5V using the VCC Pin?

Thanks!

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  • \$\begingroup\$ I would suggest not mix battery chemistries. That said, what is the "Akku" part of "Lithium-Akku" mean? Is this German for something? \$\endgroup\$ – st2000 Dec 11 '16 at 14:19
  • \$\begingroup\$ Post this question to the Amazon supplier. EE.SE isn't his volunteer application support. \$\endgroup\$ – Nick Alexeev Dec 11 '16 at 19:49
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Yes, this charger is okay for a single 3,6-4,2V li-ion cell. An ATmega328 will run fine at this voltage when you obey the clock speed limit (section 29.3 of the datasheet). Make sure to measure battery voltage using the Arduino, so you don't discharge the battery too deep.

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