4 Cells 48 Whrs

Solution
Depends on the power used by the device and how much of its capabilities are used.

A cellphone would last a very long time, a 17 inch laptop not long at all.

A computer in sleep mode much longer than one with full brightness on the screen running a demanding program.

RealBeast

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Depends on the power used by the device and how much of its capabilities are used.

A cellphone would last a very long time, a 17 inch laptop not long at all.

A computer in sleep mode much longer than one with full brightness on the screen running a demanding program.
 
Solution