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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

5v ups circuit ??

The simplest would be a Li-Ion charger with adequate rating, plus a boost converter to step up the cell voltage to 5V.

eg.
and

Or for lower currents you can get combined charger and step-up modules:
 

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