The older Etrek Vista models are 3v and therefore cannot be hardwired to a 12V battery without retaining the cigarette lighter adaptor. I have not seen the new Hcx model but also assume it is 3V.
I previously wired my Etrek vista to a 12V motorcycle battery (retaining the cigarette lighter adapter). I found the adaptor to be very unreliable offroad. The unit would constantly turn off and the fuse blew very quickly.
I suggest if you are looking for an offroad unit to be hardwired, try for a different GPS, such as a 60Csx or similar, which doesn't need the adapter. If it is just for onroad usage, you may be able to brace the cigarette adapter sufficently so it works ok.
There are a few posts on this topic in Adventure Rider if you want more info.
cheers
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