My powerbook g4 airport is kaput- replacement?

Hello,
My powerbook G4 (OS 10.4.11, aluminum case, 14 inch) has never had good internet reception.  Particularly if I am in close proximity to other computers using the internet server, it slows to a crawl or stops.  I have to be closer to the router than other computers have to be to get reception.  I can't take it anymore, and I am determined to keep this computer running as long as possible.  How do I replace the... (what's it called...the airport card??), and where can I find this part? 
While I'm at it, the battery holds charge for less than two hours when unplugged.  What kind of battery life could I be getting if I replaced (or upgraded?) the battery?  Know where I could get one?
AND...is it bad to get the occasional kernel warning?  =O)  This seems to happen when I do things the ol' gal doesn't like, like try to format an external hard drive when she only has 256 MB of RAM (I'm working on this problem- have a dead RAM slot and have to swap the 256 MB card for my new 1 GB card...
Mwahahaha!!! (Maniacal laughter while keeping old machine alive...)
THANK YOU!!

Take a look at this link for a replacement card.  At least you can get the part number or model number of the card and confirm that it is compatible with your machine.
With respect to new batteries and battery life, I cannot say what you should be getting, since my laptops are earlier vintage, but you might look at OWC for some replacements, one of which I got for the TiBooks a few months ago and seems to be holding up fine at 4-5 hours or so.  (Hope I picked the right page for that link.)

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