I recently upgraded my Lynx I with a McWill LCD. Everything works great, but today I was playing and then the music from the game stopped, and the screen got fuzzy. The batteries got hot, so I immediately removed them. I tried a different set of batteries and everything seems fine. I checked the voltage when I did the upgrade and my Lynx was at 5.01v, so I did not replace the MOSFET. Could this be why the batteries got hot (aside from use)?