Excellent portable size and looks. I picked this charger because it was small, and it had a USB input and XT-30 output. "No more adapters"! Turns out it likes QC (Quick Charge) but not PD (Power Delivery) USB bricks. I had to buy a small USB to XT-60 adapter to be able to use my 100W PD USB brick. And then the positioning of the balance plug and XT-30/60 output was stretching my battery leads dangerously so I ended up using an XT-60 to XT-30 adapter as a cable extension. So now I have an adapter into the XT-60 input and an adapter into the XT-60 output, like I would with any other charger. It's still a very nice portable charger that I'm happy with. But so much for the "no more adapters" claim. Probably a firmware update since the screenshots and initial reviews, but out of the box it supported amp outputs: 0. 5, 1, 2, 3, 5.

Very good for travelling, welded a usb c plug to an old 12 v charger. The duet works perfectly.

I use this to charge 4 1S and it works off of a USB charger as long as it has a voltage switcher built in. Works just fine with a 30W apple PD. Like any other charger, it needs to be calibrated first as it was off by 0.5V here and there.