Battery failure, heat, and no support

I am not having a good experience with Ring. My solar lights (both step and path models) are killing the batteries - both OEM and replacements. But the more significant problem is that Ring support is not helping me. They do not have replacement #18650 rechargeable Li-Ion batteries available for either replacement, nor for sale. Ring support has TWICE told me that my only recourse is to purchase my own batteries. The underlying cause could be the extreme temps of my location - Tucson, AZ. But Ring ring has (so far) been unwilling to offer any help other than, “Go out our your own and purchase new batteries.” I have done that, and the problem continues. I am stunned by their lack of investment in attempting to solve this problem.