Tools, Sharpening and Power Machinery - Cordless circular saw question

Hello-

After discovering several rotten sections of roof sheathing the other day, I bought a Craftsman 5 1/2 inch cordless circular saw to cut them out. I'm aware Craftsman doesn't have a great reputation, but I didn't have much of a choice, since quite frankly, I can't afford a more professional unit.

The 5 1/2 model:
http://www.sears.com/sr/javasr/product.do?cat=Portable+Power+Tools&pid=00911578000

I found it did the job well, but I was very frustrated to see the maximum depth is 1 9/16 inches, which isn't enough to cut a standard 2x4.

But now I see they make a 7 1/4 inch cordless saw:
http://www.sears.com/sr/javasr/product.do?cat=Portable+Power+Tools&pid=00911585000

Sometime in the next few weeks, I was planning on making a small "landing" (roughly 5' x 5') for the back door. Since I didn't want to buy a cordless saw AND a corded saw, I'm starting to wonder if I should return the 5 1/2, and get the 7 1/4.

So these are my questions:

1. Can cordless tools (specifically Craftsman's 19.2 volt system) handle a few dozen 2x4 crosscuts?

2. If I get the 7 1/4, should I return the 5 1/2? Or might the 5 1/2 come in handy someday?

Thanks.

-TM

I own both sizes of saws and that little saw is extremely useful. I use it to cut paneling, plywood, flooring, and any other thin material. It is the one saw that is safe and easy to use one-handed. for example on a roof trimming sheathing. Keep it.