I bought one of these from Amazon about 6 weeks ago:
http://tinyurl.com/jf4co9oIt is advertised at having a 13.6AH capacity. I haven't tested it with my battery analyzer yet (but will tomorrow) but it doesn't seem to be anywhere near that from what I can guesstimate from the length of time it powered my KX2. It did however start my V8 Silverado in a test of that capability. It also comes with almost every size of barrel connector you might ever need.
John AE5X
http://ae5x.blogspot.com/
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