PowerPC :: How To Identify IBook - Hardware Specifications

I know I'm a recovering PC user. Vista ran me away from PCs for good. Actually, constant crashes and the gift of an antique iBook got me off of PCs. I now have the old beat up iBook and one of those aluminum iMacs. I know also that the iMac is apparently rather looked down on, but really, it was almost perfect for me: it's like the world's nicest lap top, only not portable. At any rate, I had a major issue with a Safari update on my iBook (which I had affectionately dubbed "the Road Apple" until I learned that this is something of an insult amongst Mac users.) At any rate, the battery is really on it's absolute last legs on my venerable machine, and I'd like learning what this thing is so that I can begin the hunt for a battery.

All I can really say right now (because I don't know what to look for or what to tell you) is that it's a clamshell with a nifty built-in handle, it's white with fluorescent green "trim (?) and a white keyboard. It features a _bizarre_ power adapter that I have learned is referred to as a "yo-yo."
The "About this Mac" button gives me this:
Mac OSX 10.4.11
Processor 466 MHZ PowerPC G3
Memory 576 MB
When I click "more info," it tells me this:
Machine name: iBook
Machine Model: PowerBook 2,2 [yes; it's a comma]
CPU Type: PowerPC 750 (22.2) [a period; not a comma]
Number of CPUs: 1
CPU Speed: 467 MHz
L2 Cache (per CPU) 256 KB
Memory: 576 MB
Bus Speed: 67 MHz
Boot ROM Version: 3.3.3f3

Then there's the serial number and the Sales Order Number. Is there anyone who can give some idea of just what of all this I need to know to battery shop, and maybe some idea of the actual vintage of this machine? I'm sure it's old and outdated, but I _love_ this thing; it's stood me in great stead for some time now, and even though I _know_ those hardware specs are decrepit (at least from a PC perspective), this thing has consistently outperformed my PC (except in speed, but again: low numbers) and still outperforms my wife's new PC-based Dell netbook in everything but graphics.