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Dec 22, 2015 9:44 AM in response to tommytom24by dominic23,It is safe.
MacBook Pro 15 inch retina uses 85W MagSafe2 power adapter with MagSafe-2 style connector.
MacBook Pro 13 inch retina uses 60W MagSafe2 power adapter with MagSafe-2 style connector.
“You should use the appropriate wattage power adapter for your Apple notebook. You can use a compatible higher wattage adapter without issue, but it won't make your computer charge faster or operate differently. Lower wattage adapters will not provide enough power.”