So it sounds like you didn't buy the camera new, because they come partially charged when new. And if it was new, you should have either returned the gear to the shop for an exchange or replacement, or send it to the Canon warranty service.
Anytime you buy used gear without vetting it, you take a huge gamble. If you purchased it used and the camera has issues with storage and batteries, it sounds like you need to bite the bullet and send it to Canon for repairs. My 1DX is an absolute flawless piece of technological utopia and your story is the first that I've heard. Good luck.