Board Thread:General Nerf discussion/@comment-35749367-20180712212114/@comment-26431461-20180713225337

Those are normal 1.5V batteries, they'll just last longer because they've got more amp-hours. So yes, you can use it in a Nerf gun without any dummies, but of course, it's as powerful as any other AA battery, which means unfortunately, you'll only get stock performance out of it.

On a side note, if you don't have any dummy batteries, this video shows you how to make a temporary AA-sized homemade one, out of a Micro dart. I tried it with Trustfires and it works pretty well. In the long term however, it'll probably not last too long because it's literally a roll of aluminium shoved into a dart. Overheating is inevetable. I suggest investing in an actual dummy battery (which go for $1-3 apiece on Amazon, or in packs) or just getting an appropriately-sized steel bolt as a spacer, which is even cheaper. Both are much safer than the Blastaway.eu method, although his dirt-cheap method has served me well.