It gets red hot and explodes. You are left with a hollow tube
Disconnecting a wire from a battery would break the circuit. If the battery was powering a bulb, the lamp would go out.
It's not going to break the 3DS, but because it says to do so on the instructions, you should really follow them.
it might break your battery
The battery will explode.
It will destroy the battery.
Depends on what kind of battery
It's what happens when a battery is about to expire.
It will break and you will cry
The battery becomes hot
You will ruin the battery.
no
Replace it with a new one.