well if you suck 2 amps and its a 17 Ah battery then a good 8 hours, less if you do heaps of slewing as it will tend to suck more. putting it nicely you should get in a full night , or two nights if you are away and dont slew much. or for that quick 4 hours or so viewing somewhere, no worries. just dont plug in a dew zapper into it, then you will only get 2 hours
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