They work fine , on lower voltages ..7 . I wouldn't try them at 5 or 6 volts . Probably pop them right away . On my grand , using a 3.7 battery , with the HB atty . It's like vaping at 5 volts , more flavor and vapor , but a tad harsher . IMO
Update to post : I'm finding at 3.7 volts , I prefer a 306 LR atty. rather than the bf hybrid , and with that , have had no issues .
After all that I have heard , about possible damage , I choose , not to use them on my Reo's .
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