The battery packs or power banks charge cell phones as well as anything else that can be charged with a USB cable. They can charge the Garmin (and the Labradar). They come in different sizes. There's lots of different battery packs or power banks available.
The same goes for hard plastic cases. While Pelican and Nanuk make excellent cases, there are many others easily available in a variety of colours and sizes. I ordered one yesterday for just under $50 delivered. This one is approximately 11.6" X 8.3" X 3.7" (outside dimensions) with configurable foam inside.
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VEE Nice !! From Amazon ?