Which lens was causing problems on your bodies, this might help answer another post about a 7D battery drain if it was a 24-105 f4L
Link to question. http://www.canonrumors.com/forum/index.php?topic=19970.msg377117#msg377117
Edit to add link.
Sorry I can't be much more of help. I don't own the 1DX. I just had a battery drain problem with my 5D MKII and 6D. it turned out that it was caused by a lens problem
« Last Edit: April 06, 2014, 02:43:52 PM by Valvebounce »
7DII+Grip, 7D+Grip, 40D+Grip, 5D+Grip, EF 24-105 f4L EF-S 17-85, EF-S 10-22, EF 70-200 f2.8 L IS II, EF 2x III, EF 100-400 f/4.5-5.6l IS II, Σ17-70 f2.8-4 C, EF 50mm f1.8, 550EX, Triopo TR-985, Filters Remotes Macro tubes Tripod heads etc!
5D, 20D, 24-105, BG-E4, BG-E2N, 17-85, Nifty 50 pre owned.