If you don't mind, I've set the reply-to to the offtopic mail list. On 2018-01-07 20:24, Wol's lists wrote:
On 07/01/18 14:13, Carlos E. R. wrote:
The downside seemed to be that it sucked the battery in the camera or phone. I do not know why.
The USB cable should be charging the battery, not discharging it.
But mi camera can't be charged by usb cable. Downloading photos discharges battery in this camera.
And this is NORMAL.
It's only pretty recently that the use of USB as the SOLE connector for phones has become common, and with that the use of USB for charging. An older phone has separate power and data connectors. Same for cameras. Of all the cameras I've seen/used, only ONE uses USB for charging, and that's a recent Sony.
My "old" compact, a Samsung, does charge via USB (but the cable is special). My new SLR Nikon, a D3200, doesn't.
Most cameras I know of, 0.5A at 5V would take a month of Sundays to charge the battery ...
I don't know how much my SLR draws. But even if takes days to charge, it would mean that it would not discharge, which is what happens now. It can take an hour to pull 32 gig of photos at usb2 speed. 480Mbits/s... lets say 40MB/s, so... 13.3 minutes? Can't be, it took much more last time. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)