I am trying to get an extra battery magazine for my battery grip, the BG-E20. The part number on the magazine and the one listed in "Package contents", is BGM-E20L. Canon parts has no such item listed/in inventory. Does that mean when the time comes that I lose or break mine, I have to buy a new battery grip for my 5D IV? Any suggestions? I had the same issue with a replacement magazine for my 7D II (BG-E16) but finally found the Canon Part number to order it! (#CC341956) Happy New Year!