Recently purchased a used Canon 6D and have found that it is discharging batteries (new Canon make) at an alarming rate. Put a fully charged battery into it and left the caera for a few days then went to use it but couldn't switch it on as the battery was dead. I have checked that Wifi and GPS are both switched off. Both batteries are in good condition and maintain a charge. Anybody else experienced this or any suggestions as to how to rectify this
