Heath,
to power the EQ6 I use one 1200A (24A/h) jumpstarter - works all night long
for the laptop (and guidecam) I use a second one of those. This also prevents ground loops.
Those 1200A jump starters are all the same. I got one from Autobarn in Melbourne and another one from supercheap in Auckland and even though they are branded differently, the power tank is the same.
Not sure about your links as they are both broken.
If you have mains available - get a transformer. Bintel convinced me getting one and I havenīt regreted it. You may pay the same as for a battery. But since I do most imaging from the backyard batteries only get used for the odd field trip (that needs so much more careful planning in advance+cloud uncertainty that I canīt be bothered most of the time).
Hope that helps!
Cheers
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