Fried the driver?! I don't think I'll try now. :-[styropyro said:Yep sounds like your typical NewWish laser. :-/ A 10440 battery won't last as long as the AAAs in your laser IIRC. I think a while back somebody tried something like this and it fried the driver.
I wouldn't try so myself. Like others suggested, get some nice rechargeable NiMH AAAs.freshert said:Would 4.2v kill the pen laser from Optotronics? I was thinking of using a 10440 lithium battery with a dummy AAA so I wouldn't have to waste so much money on batteries.