https://www.indiegogo.com/projects/batteriser-extend-battery-life-by-up-to-8x#/story
These purport to extend the life of a battery by 8x, but it seems too good to be true...?
There is a little back story (conspiracy theory) about how the guy who invented them had the designs and prototypes stolen from his home blah blah blah.
I've ordered some and will give them a go later in the year when they arrive. Has anyone else?