Today in the post I received a Bosch Go Professional Screwdriver from GearBest.
Here’s the link: https://goo.gl/3FD61q
Every word of the manual was in Chinese – but thanks to Google I immediately found the multilingual pdf manual online complete with a comprehensive English section.
As it turns out, the manual isn’t really needed, well, I didn’t need it anyway. Plug the screwdriver into any USB power unit (or any handy USB supply) - with the lead supplied – (that’s what I did) and lo, a short time later, one fully charged screwdriver. Of course it was probably most of the way there before I started.