5v ups circuit ??

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

eg.

3.7V to 5V 3A DC-DC Boost Converter Li-ion Battery 3V-5V Step Up Voltage Board | eBay

Find many great new & used options and get the best deals for 3.7V to 5V 3A DC-DC Boost Converter Li-ion Battery 3V-5V Step Up Voltage Board at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk
and

5V 2A 3.7V 4.2V Li-ion Lithium Lipo 18650 Battery Charger Module Charging Board | eBay

Max output charging current: 2A. Charging indicator: charging red. 1pcs x Battery charging Module. Input interface: Pin Hole solder pad. Board size:20MM 13MM. We maintain the excellent service standards.
www.ebay.co.uk

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

Li-ion 18650 3.7V 4.2V Battery Charger Board DC-DC Step Up Boost Module ^FTyu | eBay

Find many great new & used options and get the best deals for Li-ion 18650 3.7V 4.2V Battery Charger Board DC-DC Step Up Boost Module ^FTyu at the best online prices at eBay! Free delivery for many products!
www.ebay.co.uk
 
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