Here's an idea... for about the same price how about a remote (wired or wireless) video camera setup on the target?
Added bonus of taking video of the shots taken.
$1000 would go a ways to making that possible.
12v marine battery takes care of this. Add a solar charger and it's ready for you when you get there.Good idea, but kinda out of the question depending on power source locations. my laptop gets 2hrs of use alone on the battery, and most of the time if im doing any long range stuff im out there for 4hrs or more