Yes, it is possible for a battery to suddenly seem empty. This can have several causes:

1. Incorrect display of battery level: Sometimes the battery indicator on a device can be inaccurate and show an incorrect battery level. This can make it seem as if the battery is suddenly empty, while it still has some charge.

2. Interruption of power supply: If there is a sudden interruption of the power supply to the device, the battery may no longer charge or energy may be consumed quickly, making it appear as if the battery is suddenly empty.

3. Defective battery: A battery can become defective due to aging, damage, or other factors. If a battery is defective, it can lose its charge quickly and it may appear that the battery is suddenly empty.

4. Not used for too long: If a battery is not used for a long period, it can become discharged by itself. This is due to the natural self-discharge process of the battery. When you then want to use the battery again, it seems as if it is suddenly empty.

If you are dealing with a battery that seems to suddenly be empty, it is advisable to charge the battery according to the manufacturer's instructions. If the problem persists, it may be necessary to replace the battery or seek professional advice.