We used a marine 12 Volt battery and an invertor to plug the Apple charger into. It ran for days on a charge.
For us, this was the best setup since we could not chance a failure during show time.
I need a good, strong external battery to use with my MacBook Pro at a tradeshow. Need to run for about 10 hours on the combination of internal and external battery. Wifi OFF, that's a huge power savings. This is a 17”, the kind that wants an 85 W charger (though I can get away with a 65 W), and I'm reading that not all external batteries can handle this load. And, as a side benefit, I'd like to be able to charge my iPhone from it.
Looking for recommendations!
Thanks to all,