I have a Vortex Venom on a Springfield Armory XDm-9 with thousands of rounds through it. It's my daily carry pistol and sees much abuse and I've never had the battery cap come loose. Have another one on my Benelli SBE2 turkey gun with hundreds of rounds through it...same. That being said, I do understand that Mr Murphy is always just around the corner. Having a backup rifle, backup irons, backup scope, backup batteries...I get it. I just have a limit on what I'm willing to pack. At some point, I can only be so prepared for what may or may not happen. I will improvise, adapt and overcome from there.