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I actually double posted - unintentionally, and found that I couldn't delete the whole thing.
I'm currently using a Celestron Power Tank with my school's telescope. Initially I used it for running an EQ5 mount, but now use it for the dew heater only. When used for just running the scope I comfortably got four-five hours out of it if I ensured that it was fully charged before I started. I did notice that after several months of use its performance was starting to drop off a bit, but since running on mains power at home I haven't tried it on the mount for quite some time.
Paul
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