Buying a Second Battery–Apple or OEM?

Has anyone bought a second battery for their 12"? I'd like to buy a back-up one for plane use, and just as a general back-up battery. I see a bunch on eBay called "OEM" batteries for around $30–$50 and i'm wondering if they're really OK to use in the machine or not? Safe? Do they perform better or worse?
Please let me know if you have any experience with them, or even if you've bought from eBay let me know which user and if they were good to deal with! Thanks so much in advance

Hi DC
I have some questions that sort of relate to your topic so I hope you don't mind if I piggyback on your post.
30 to 50 dollars seems a great price .
As I recall the Apple batteries are around $130
I shopped around and got one from Priority Electronics for $100 .
They offer a 1 year warranty and have phone support.
I am considering returning it because I think it may be weak .
I would appreciate some comments regarding these numbers .
It was recommended that I run the battery down at least 5 times to achieve the maximum Full Charge Capacity (FCC)
The battery was holding an FCC of over 4000 (mAh) at around 12 cycles and at 28 it's FCC was down to 3411 . Now at 33 cycles its FCC is 3916 I have read that the Full Charge Capacity (FCC) on a new battery for a 12'PB should be around 4500(mAh) .
bob
Powerbook   Mac OS X (10.4.6)   Panther eMac

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