T20 replacement battery: real IBM or aftermarket clone?

[acz]

The main battery in my well-worn T20 (2647-44u) won't hold a charge any more. Fortunately, I have the ultrabay 2000 battery which is a little younger and has been used less.
But often I need the bay for the floppy or the CD drive.
So, I figure that after six years of hard service, I need to replace that primary battery. There seem to be all kinds of aftermarket clone replacements and a wide range of prices on the web and on eBay.
The battery (part 02k6649) from IBM costs $189 (!).
Does anyone have a good experience with a cheaper equivalent? Thanks.

[warreng24]

I looked up the IBM part number for your battery, is it 02K6649?

I keyed that into the pricegrabber.com search and I found a $73 one from pinnacletechnologyusa.com.

I've purchased from pinnacle before, and they seem quite decent.

-Warren
T42 2378-FVU

[lfeagan]

I have had Interstate Battery rebuild my packs for me with the Li-Ion cells of my choosing. I have also had them rebuild NiMH and NiCD packs for various devices such as laptops, mutlimeters, other things like that. If you have one near you they can do it for you and generally at a very good price.

Goto
http://www.ibsa.com/
To find a location near you.

The type of cell I am 99% certain you would need to use is this one:
http://sanyo.wslogic.com/pdf/pdfs/UR18650F.pdf
Pretty much all laptops use a cell of those dimensions.

[acz]

Thanks for the suggestions.
I was browsing around the web and found the following interesting solution:

http://www.batteryrefill.com/laptops/ibm/02K6649.phtml

If I understand it correctly, they exchange your old battery for a refurbished one. The price is $60 if you send them the old battery pack and $70 if you don't send in the old pack. What makes it interesting is that they use different cells to get a 30% increase in capacity over the original OEM specs.