Can anyone tell me how low a battery can get before a rig goes down? I use the iPower rechargeable lithium ion batteries that, fully charged, are 8.4V. I put a fully charged one in my ZX (with internal wireless) and left it on for approximately 70 minutes, after which the battery tested at 8.1V. I assume that the draw will be more while playing (haven't tested that scenerio yet)? I haven't been let down yet and I have no problem with swapping a fully charged battery between sets. Just wonder if anyone knows what the limit is?