While I don't have that particular Quark, I do have a couple of Quarks. I have the 123 and a mini for pocket carry. Great lights. I have given up on alkaline batteries though for a light I might actually need to use. Though they are cheaper than CR123s I got tired of going to use a light that had been setting for a little while only to find it was dead or so dim that I had to scramble in my battery stash to power it up. Yes, CR lithiums cost a little more but can last years if waiting to be used.