I was running Nimh batteries in all of my guns before I stepped away, but had bought an internal conversion kit and corresponding LiPo for my KAC PDW. I didn't have a balance charger at the time so never got round to using it, but it will be sat in one of the storage boxes. I'll follow your advice and get rid of it ASAP! Fair point on the seals, not really worth the hassle when I could just replace with new. Once I've done a full inventory, I'll get an order in for new hop buckings and any orings I'll need for the mags.