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I contacted them and was told batteries only have a 30 day warranty. However they will make an exception and send out a new battery right away. No hassle!

Oh it works fine if I let it heat up. I also tested the extra battery I got which is a 770 and with it I can draw after 5 seconds. The 750 battery it came with is the one I have to let the firefly heat up more with.

I've never had fast heat up times on my firefly. Holding the button for 5-10 seconds and then drawing results in nothing. Instead I hold it down for 8, off for 1 and then hold for 8 again. I repeat this 4 or 5 times until the firefly feels warm and then draw while holding the button down...