I am still pretty new to this, but it doesn't seem like that is the solution. I am using a larger cell recharger type battery with two regulated 2.5A max outputs and it works very well. I think you are always better off having the required power available directly from the battery.
Mine is https://www.ravpower.com/16750mah-porta ... black.html
The only issue with the one I linked is that it will shut down if there isn't enough power draw on it. For example, I have a servo board on it and when I was only driving that board, it would shut down. If I run the Pi and that board, it works fine.