Are old Tamagotchi batteries dangerous if left inside?

Yes — old batteries left inside a Tamagotchi can become dangerous over time, especially if they leak or corrode. The main risk is usually to the toy itself, but leaked battery residue can also irritate skin and eyes.

What can happen
Many Tamagotchis use small button cells such as LR44 or CR2032, but the exact battery type depends on the model. Over time, batteries can leak a white, crusty residue that can corrode the battery contacts and damage the device’s internal circuitry.

Risk to you
If you touch the residue with bare skin, it may cause irritation. Avoid getting it in your eyes or mouth.

What to do

• If you’re storing the Tamagotchi for a while, remove the batteries.
• If you see crusty residue, handle it with care and avoid touching it directly.
• Clean the contacts carefully with a cotton swab dipped in a little white vinegar or lemon juice, then wipe with isopropyl alcohol and let everything dry fully before using new batteries.

If the batteries are leaking badly, replace and dispose of them promptly and keep them away from children and pets.