Manafont say that I can use 2xAA [from product page]: "Battery Configurations: 1 x 1.2V/1.5V AA, or 2 x 1.2V/1.5V AA batteries (need to add extension tube for 2 AA batteries,which is not included.Please check SKU 4989)", "Voltage Input: 3V Max".
Tank007 say I can't (or shouldn't?) [from email]: "For 1W 365nm TK566 UV light, no extension tube is allowed to use."
Do they use a different driver to boost the voltage? Unlikely.
So - is there any chance that by using 2xAA I will ruin the driver or the emitter?
I can't open the head and take a look at the driver itself, so that makes it trickier to know... but theoretically - why would the driver care how much voltage it gets supplied to as long as it is below the LED's Vf? (which shouldn't be different from any other LED, I think)
I imagine (This is speculation, not actual knowledge) that the forward voltage of a UV LED is very much higher than that of a blue LED (Which is what all white LEDs are under the phosphor). It is certainly more than 1.5V, probably over 4 for a short wavelength LED. This means the driver has to give a hefty boost to the voltage to get the LED to light. A small rise in input voltage may mean a very large rise in output voltage depending on how the driver is designed. It might work at 3V, but it might cook the LED.
I'd fear the latter is more likely.
But this could be complete rubbish - as I said this is speculation, not actual knowledge.
It would be best to try 2 almost depleted AA's doing something like 2V combined and try for a brief time to see what happens. That is if you really want to know. Otherwise i would leave it alone. Or contact your seller for getting the right specs. If burns out when it should not... replacement kicks in... :/
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