Thanks for pointing me in the right direction, a good old Bri-post!
Although the link he mentions is broken.
So given Brian's form, this tiny sucker would only provide 2.4 hours of runtime with a UA-5. Hmmm
And the other battery that I posted recently (1700mAh) is good for 3 hours. Workable, but not worth the risk running out of juice.
Back to the drawing board...