Graco Pack'n Play Newborn2Toddler Playard Owner's Manual page 5

FOR SAFE BATTERY USE:
Keep the batteries out of children's reach.
Discard leaky batteries immediately. When discarding batteries, be sure
to dispose of them in the proper manner, according to your state and
local regulations.
To prevent battery leaks, which can burn skin and eyes:
• Remove battery when storing product for a long time.
• Dispose of used battery immediately.
Recommended type battery—alkaline disposables, 1-D (LR20-1.5V).
Change batteries when product ceases to operate satisfactorily.
5