Hello. How many hours will supply it as extra battery for MacBook Pro 15" (2018 edition) ?

Anker PowerCore Fusion Power Delivery Battery and Charger

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  • The 15” MBP ships with a 87W power adapter. This battery outputs at 30W maximum. The 15” MBP can consume at least 60W easily. This device would not be ideal for a 15” MBP owner as you wouldn’t get any benefit from it.

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