Use the charger that came with this device" error

My Q5 has suddenly started showing an error message suggesting that I "use the charger that came with this device" when plugged in on that charger. Sometime it then stops charging, other times charges to completion.

Does anyone know why this could be a problem? I have used battery backup chargers a couple of times, but otherwise nothing has changed and battery health on the device, which is less than a month old, is showing Good in BB diagnostic app. Could the charging link have been damaged by using such batteries, or is it more likley a defective cable? (I have already tried two different charging cubes from Blackberry with the same results).

Thanks for your help.

If you've been using the same cable with different chargers and always getting the error message, then you should definitely try a new cable. Hopefully that will solve the problem.

The old short usb cable is great for charging, it's small but good

CB10 - Q10