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Rene, I agree with raymo, that battery pack won't be any good for you. If you can, cancel it and ask for a better option.
7 AH is a very small capacity and might not see you through a nights observing. If you want to plug anything else in, like dew heaters, it will only last a few hours. I have a 18 AH for use at home and that gets me through one night only, running the scope, dew heaters and fans. It's good because it is light weight, but I have to charge it after every session. When I go away I have a 65 AH that lasts a few days.
So if you want one of those power tank type setups as a minimum get the 18 AH version.
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