Best way to get a compact/portable 5V supply for a project?

Hi everyone,

I’m working on a portable audio project and I’m looking for the best way to power it. I need a stable 5V supply, but the project needs to be as compact and slim as possible.

I am new to electronics, so I’m not sure which approach is more efficient or easier to implement.

I was considering using Li-ion batteries, but I’m a bit confused:

• Should I use two 3.7V batteries in series with a step-down converter?
• Or should I use a single 3.7V Li-Po battery with a 5V boost converter?