If you have a call box that is powered by a 12-volt gel cell (mine is a Minaska Big Country powered by a 1.2 AH gel cell) and you would like the option of solar charging your unit, it's quick and easy. Go on eBay and use this link to order Ebay link to solar panel
Output: 2+/- Watts / Actual size: 6-1/2"x4-3/4"x1/2" The eBay seller is: chaslyncompany ( 1595 ), Price is $24.95. It was a quick delivery and that little sucker puts out the juice. If you don't believe me, stick your tongue on the contacts when you get it set up and you'll be a believer......LOL Here is a photo of the panel. You'll have to cut the plug off to install the plug of your choice. I used an RCA type plug.
Below is a photo of the outside of the caller with the female solar charging receptacle installed.
Below is a pic of the inside showing the wiring direct to the battery. Make sure you have the polarity correct!!!
Below...On stand, I drape the call box and the solar panel with netting to create a more natural appearance. The decoy is the only exposed object. Just one layer of net over the panel's face still allows for plenty of charging surface.
The solar option is nice if you want to set your caller out and hunker down for as long as you want before calling. As it sits there, it's charging. My Minaska also has a built-in decoy and the panel helps to offset battery drain. It's great too because I can charge up anytime and anywhere there is sunlight. I believe a solar charger can also be used with just about any type of rechargeable battery system. It's well worth the money spent. It might even save your bacon if your rig's battery goes flat. Enjoy....