I was told that the old Canon FTB SLR camera was different than other mercury battery cameras because they were designed to use non-mercury too. He said Weincell PX13 or PX625 won't
Original Exfo Ftb-200 Battery Pack Large 14.4v 6600mah For Exfo Otdr Ftb-1 Ftb-200 Ftb-150 Otdr Battery - Fiber Optic Equipment - AliExpress