I have one NiMH and one Lithium Ike battery. We put them both in a Pelican carryon with the plastic Ikelite caps locked in place to prevent the batteries from shorting on anything else. One thing to consider when deciding to check camera gear isn't just the risk of having stuff stolen, but if TSA xrays it and decides to open and search your bag, there is very little chance they are going to get it all repacked properly. We used to put our housing and some of the other stuff we considered more durable in a checked bag, until TSA reshuffled our stuff once and then repacked it poorly. Luckily it was on the trip home, but they managed to bend one of the handles on our tray about 15 degrees in toward the housing. Just enough that you can't operate the levers to open the housing with it attached.