hp50g and power bank

[TravisE]

I've done some tests of my own in the past, and in my experience, the 50g does draw power from USB when available, rather than the batteries, so plugging it into a USB power source should save the batteries (it wasn't necessary to remove the batteries; they can be left in place, and the calculator will seamlessly switch back to battery power automatically if USB power fails). However, I've had the same trouble with USB power banks. Mine also only likes to stay on and provide power when the CPU is running at 100%. I've sometimes had to plug in an extra USB device of some kind (my bank has two ports) to draw enough current to keep the bank on.