Secondhand NiteStar 3 watt; Information please?

Vulpes Abnocto

Newly Enlightened
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Jan 12, 2015
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Today I was given a hand-me-down LED light, labelled a "NiteStar 3 Watt LED Torch" I've done some searching around regarding these flashlights and it seems that most people must be talking about newer versions of this light because mine is not focusable.
In any case, inside the battery housing I found one RCR123A battery, left there for future reference in buying batteries.
My main question is whether the CR123A or RCR123A is the only battery that I can use in this light, or is there perhaps a single battery that could take the place of these two (I dunno, maybe a 16350 or something).
Thank you for your time!
 
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