A few comments on the subject:
The HP-15C is exactly the same keyboard and function as the Saturn series processor...
The new 15c is essentially a Saturn emulator...one which doesn't emulate the [ON] + [multiply] self-test at that despite the instructions given in the manual.
Is the new Kinpo made HP-15C based on the Sunpak 6502 core as durable as the origianl Saturn series processor? Will the battery life be as long as the Saturn with the three SR44 silver oxide batteries?
I don't think the question is of durability. After all, we are talking about packaged silicon in an enclosure not intended for regular disassembly. Computation-wise, this is not an issue; if you're using a 15c to perform a calculation that requires more than a few seconds, then you're probably using the wrong tool for the job to begin with.
I think the question is really about power robustness, i.e. given that the calculator's architecture is an emulator of legacy hardware, how will it perform with respect to battery life? I would like to think the technology node that the 6502 is fabricated at suggests comparable longevity. In terms of mAh, three SR44 ~= two CR2032, and visible form factor isn't affected so this isn't really an issue (unless you're one of those "purist" nonsense types). If the 6502 implements low-power states, then I don't think power will be an issue. Nevertheless, if the calculator lasts a years before having to replace batteries, then I'd be fully satisfied; judging by the performance of my 35s, I don't think the new 15c will have any issues meeting this benchmark.
The HP-15C market is very volatile. It is like a speculator or bubble inflation market. It is meant to do math, why so much speculator like a house? ... I have never seen an HP product bought to be resold for higher prices. What happened to our economy?
This happens all the time, e.g. think of every new Apple release. And if you think technology scalping is bad, you need to look into ticket scalping; it's so bad that some states in the US have outlawed it. The real problem are these business-oriented idiots who dive into the tools of a niche community without an understanding of how the product became so popular to begin with. For all we know, these guys probably based all their business decisions on the nominal selling price of 2nd-hand calculators on eBay. In the end, however, these scalpers are the only one's who will end up losing.