Is it ok do use these batteries until they die. A couple of times I used them until they were completely dead before I recharged them. Is it better to put them back on the charger before they are completely dead? Also, I have some coin tubes that I want to use to carry extra batteries. If they are in the plastic tube and they are touching each other.... could that be bad for the battery? They would be stacked if they were in the tube. Or should I put something in between them so they don't make contact with each other.
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