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You need alkaline batteries. Heavy duty batteries are crap for this application. From my experience owning a LOT of 532nm units you are likely drawing closer to 400mA as I would expect that laser to be over spec.
Every laser I own of theirs is over spec and will output more with more voltage. Personally I would recommend lithium AAA but they are expensive although you can get a decent deal on them on Ebay. The main difference I've seen between advanced and ultimate lithium are the ultimates start at a higher voltage. The batteries used in these make a HUGE difference in output.
 
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this ones no good only like 40mw the blue version however is 1.3 watts i tested both
 


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