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Hi Stefan,
For JUST powering the scope, the 9 ah will keep you going all night.
But if you start running dew heaters (as most need to eventually) then the 17ah may even struggle after about 4 hours.
The ah rating needs to be taken with a grain of salt, as you should not completely drain a deep cycle battery. But in theory if drawing 1 amp (and most scopes are less than that) it should run 9 and 17 hours respectively.
A lot of people use the 17ah pack at the pony club.
I use a 33ah deep cycly battery but I run upto 4 dew heaters.
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