What type and how many batteries does the Simple Sway require?
The swing requires four D (LR20-1.5V) cell batteries for the main swing motor. The vibration module (on certain models) requires one additional D (LR20-1.5V) battery installed under the seat. Alkaline disposable batteries are recommended, and you should never mix battery types.
From the official Graco Simple Sway Infant Swing manual, page 17
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