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Tony you can use any 12V source that can supply the needed amperage to the mount. My NEQ6 draws 2amps so I would expect the HEQ5 to be the same. I use small 12V home alarm system batteries (12V, 7amp hr) three of these wired in parallel, in a single toolbox type case, for 21amps in total ,which cost about $20 each on ebay. IF you go with at battery you will need a way to charge it, and any auto battery charger will do.
With the Jump Start packs just be aware that they are built for a short high amp use (starting a car) and have a reputation for not lasting very long if they are not kept constantly charged up. They will work, but keep them charged all the time if possible.
Yes the Bintel power supply is usually a good product and will do the job, but you need AC input all the time, something not usually available if you go out to a dark site. That's where a battery system will be advantagous.
Call Bintel and get that power supply replaced under warranty.
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