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Re:Opinion: How Apple could have prevented the iPhone-slowdo... by DonHopkins on Saturday December 23, 2017 @08:26PM (#15997366)
And if USB-C doesn't provide enough amps for you, there's always jumper cables.

https://www.engadget.com/2014/07/14/junojumpr-jumpstart-your...

Re:Opinion: How Apple could have prevented the iPhone-slowdo... by ComputerGuru on Saturday December 23, 2017 @10:06PM (#15997660)
I have to admit I’m a bit disappointed. I was hoping to see a real, full-size car battery.

I actually have three absorbent glass mat batteries hooked up to a Noco Genius battery tender and a 1000W 12V inverter to provide battery backup for my sump pumps (long story). Losslessly converting that to 5V shouldn’t be too hard.