Is there softcopy of (PDF) user manual for the 70mai jump starter available online? where to download?
All the manuals are here:
https://www.70mai.com/en/download/
70mai Jump Starter User Manual:
https://cdn-res.70mai.com/wp-content/uploads/2019/08/70mai-Jump-Starter_multi-language_20190625.pdf
Good luck.