I was assuming that the higher the number, the better the battery. If the difference is more runtime, that's fine. I didn't notice any difference in the output of my minimag with a BB400, and it didn't improve the output of my minimag with an Inretech adapter either. I have not tried the batteries in a UK4AA. I'm a newbie, I was interested in knowing what improvement I should be looking for, if any.
Thanks,
Jim