Comment by cheesecompiler

In the 70s, the Polaroid SX-70 camera included a disposable battery in every film pack. After 10 shots, you threw away both it and the plastic film case with its large metal spring mechanism. When the film production stopped in the late 00s, you could use 600 film designed for other polaroid bodies reloaded into a 779 native SX70 cartridge, because the battery would last much longer than the initial 10 shots.