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The battery fluid is leaking

These are possible reasons for leaky batteries:

  1. The date of expiry of the batteries has passed.
  2. The batteries were stored improperly, e.g. in the sun.
  3. Empty batteries were kept for a long time inside the Game Boy.

This defect can only occur through the owner's own negligence. Such negligence arises if devices, accessories or games are handled incorrectly.