I don't understand your question. I mean that if you going to use the device in future you might need the battery. And a supply of replacement batteries may jus

I don't understand your question. I mean that if you going to use the device in future you might need the battery. And a supply of replacement batteries may just stop. Especially I mean original replacement batteries. For example, the legendary BL-4C is available in my country only as non-original version having half of capacity or less.