Noco GB40 Genius Boost Problems Common problems associated with the Noco GB40 Genius Boost https://jumpstartersguide.com include: You might end up with a defective unit that does not charge (if this is the case then you maybe able to get a replacement if in warranty period). Might not have the power to jump start vehicles greater the 2 litres. Build quality might not be what you expected. You may hear clicking noises. Noco GB40 Genius Boost However, many users in fact most have a had a positive experience of using this model ( noco gb40 review ). This is a very well produced item, can not fault the quality. I acquired this just to keep in my own ...