If you hold the console for a while, it may have faded. This kind of fading and yellowing is not easy to detect. Replaces your broken or scratched battery cover.
The Gameboy Colour Pokemon Blue Battery Covers are not Genuine GBC but a very good replica even down to the 7 mold circle mark. The only way i could tell the difference from genuine and replacement was the weight genuine was 2.4 grams lighter. Great product good replacement Thanks +++