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Les
Up until SPSP, when my big battery died, I used a 90 amp hour for my laptop and a 40 amp hour battery for everything else, dew heater, mount and cameras. It would last me all night long in that configuration although the smaller battery would be fairly hungry for a recharge at the end of an all nighter particularly in Winter.
Now the 90 amp hour has passed on to a better place, I now use 2x 70 amp hour in it's place. One dedicated to the laptop and the other dedicated to dew heaters and cameras.
I haven't had the chance to test the new power setup since SPSP as I have not been out a single night due to Sydney's very inclement weather.
Hope that insight is of benefit.
Wayne
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