Oh my! A new tacky marketing bs video preview got released. Seems the new, new, name is "Batteroo Boost" and they haven't given up pedalling them just yet...
What is marginally interesting in the video is the suggestion is to put the sleeve on after the battery has died, and then when they show the graphic of a depleted battery, the % remaining is only 2%. Isn't that an order of magnitude less than their original bs claims of 20% remaining ?