Switch camera off and if not use is more than few days, remove battery completely from camera. That is what one should do with any battery powered device. If course if battery is not removable than just switch device off.

If camera is on it will use battery power for LCD if nothing else. And even if camera is off it will drain small amount of power. And some batteries can leak if battery is inside of device which is not used for prolonged period. I forgot to remove batteries (NiMH) from mine bicycle light, light was off and discovered I had to replace 2 of 5 batteries as electrolites leaked out from batteries.

Oposite from digi cameras, analog cameras are workable in a same moment when you switch it on, there is no power lag like with digi cameras, so there is no need not to swtch camera off when not use it.