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Hi Karl,
I used one of these for a couple of years to power my goto scopes. I just noticed in the past few months that it starts to "beep" after about 4-5 hours of use, indicating low charge (even though the indicator button would suggest otherwise - I think it starts to beep at 60%). They tend to not like the cold, so I kept mine rugged up in a blanket to maximise performance. You should get a couple of years at least out of it before the performance starts to wane, and even then you should still get several hours out of it, depending on what you're running off it. I've upgraded to the bigger version, but it's substantially more bulky and heavy, and I might start to look at some of the compact Lithium Ion batteries that are getting about.
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