I've got a couple of those Sean, they work pretty good. I keep them in pelican cases and last two months between recharge.Nothing at HD. It was pouring so I didn't mess with going to any of the outdoor places. Picked this one up at Tractor Supply. I'll see how it does.
https://www.stack-on.com/categories/accessories/products/83
sean, do you keep your new safe in a conditioned environment ??