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Nintendo's Battery Case (DMG-05) uses four replaceable C batteries to give the Game Boy about 40 hours of extra power, far more than the standard AA setup.
The trade-off is size and weight: it is much larger and heavier than the rechargeable DMG-03. It was released only in Japan and is almost impossible to find today.
More from the Museum's Journal: Keeping the Lights On: Powering the Game Boy.
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