Any progress on the power supply?
I checked the difference between charging while on or off, and actually doesn’t matter. the differences I’ve seen are most probably due to differences in voltage (used different PC and also an external USB charger).
using the same consistent supply (macbook usb), I get a consistent 5-10 min of operating time with 5-10 hours of charge!
very sorry of this, if it wasn’t for the battery life I’d have pre-ordered another one or two for my lab!
let me know if you come out with a soultion, the only one I have is to use a different power supply with slightly higher voltage, but it’s risky and not convenient, the nice thing in usb devices is just that you do not need an external charger