The ideal portable battery pack for carrying about in your bag. I use it to charge my Xiaomi smartphone, Xiaomi headphones, and my 16-inch MacBook Pro. It also charges my Xiaomi powerbank. Although I didn't measure it, I believe it delivers the power that was advertised. The MacBook may reach temperatures of up to 70 degrees Fahrenheit when it is being charged, yet the process only takes a few of hours to complete.
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