Button batteries put together after the heat, about half an hour, after the separation can also be used?
Half an hour basically no available value. Choose from the inside of the battery is not short-circuit can also be used. Test voltage with a multimeter, 1.3V can be thrown away.
The battery has caused a short circuit, and basically no electricity, you can use the voltmeter regardless of battery voltage, high voltage or can be used, but the use of time is not long.
Fever is because some batteries are shorted by another battery, and this time the resistance is zero, the current reaches the limit. The electricity is consumed quickly.
