I have been using the AW-2200 battery for six months in my V3I and love it. Sure it's expensive but who cares. It's like buying a 4000 dollar bicycle and then complaining about how expensive the spd shoes are for your clip less pedals. If I have one complaint about my V3I it was the Nimh battery. I can't even think of an electronic device that wasn't built in the 90's that runs on Nimh. Who wants a battery that begins to discharge the second you take it out of the charger. The orange Nimh would only run for a couple of hours and even less with the tx boost on. I relic hunt and sometimes have to hike miles to get to my sites and didn't want to carry multiple batteries on top of all my other equipment and water. I also appreciate that it knocks off almost a half pound off of my detector. The AW-2200 is a great battery for a detector that frankly, is a bit of a battery hog.