Ok, having a quick last look, if the heater runs at 1.4A the battery will last almost 10 hours, that's full charge in good conditions and JUST the heater. So it really depends on how much that EQ5 and Synscan uses. If it uses anything close to 1.4A then you'll have to halve the time to 5 hours. I guess, looking at it again, if you DO sometimes stay out a long time and use the go to a couple of times an hour, you might be pushing it to last the whole session... But it's definitely still worth giving a go.
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