Uno Lithium Battery
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4 Ways to Power Your Arduino:
Outer power supply, or battery, going into the 2.1mm x 5.5mm DC power jack (suggested 7~12V info)
Outside power supply, or battery, going into the "VIN" and "GND" pins on the board, through jumpers (suggested 7~12V information)
Outer, managed 5V power going straight into the "5V" and "GND" pins; this might in fact come from another Arduino's 5V and GND pins.
I would investigate getting one of those Lithium-Ion cell packs that put out an ostensible 7.2V and interfacing that to the DC power jack - organizations like Tenergy make trustworthy ones.
Check the power necessities of your Arduino project against the power limit of the cell packs to work out generally how much run time you can anticipate while utilizing them to drive it.
Standard Engineer's reaction: It depends!
A solitary Lithium-Ion battery's terminal voltage will go from 4.2V completely energized, down to as low as 2.7V totally level, yet regularly no lower than 3.0V - it relies upon the specs of the cell, and of the Cell Protection Module that is essential for the cell (prepares for working at too low or high a voltage, or drawing a lot of current).
Consequently that lets us know that we want to focus on the Vcc supply voltage that the microcontroller (and all the other things on the Arduino Uno) will dependably run at.