Otheronek is right.One thing though: The battery that is pictured might actually be a replacement other than the one shown.Reason I say this is because I ordered the same battery from 2 separate places(Radio shack being one), and the battery they sent me is different than the one pictured.I don't think the one pictured they make anymore.The replacement is similar,but just slightly less rounder.In othe words,if you happen to use the CP4 shotguns for your Nak 300's,the battery might be just a little loose when you insert the battery inside the Nak300 mic.When you go to screw the CP4 shotgun into the mic,the battery might be very slightly loose.You can help it connect better by wrapping the battery a few times with electrical tape.Hope this makes sense.Good luck!