/diy/ - Do It Yourself

I want to recycle some 18650 cells to power a Raspberry pi (+ screen and periphals).
I realize that I want a board to do the heavy lifting for me, so pic related are two I found. (1) is one you can get cheap from china, but it's only rated for 1 amp, and a Rpi can take up to 2.5 A from what I heard.
(2) is more expensive, but is rated for 2.1A which sounds better. Is that going to be okay? If not where do I find boards that are rated for that? What do I need to look at other than voltage, current and interface?

Lastly, they seem to assume one battery attached. If I wanted a higher capacity, can I just add more Li-ion cells in parallel?