The wikipedia seems to keep using words like “it claimed to X”

Also

The shipping date for the product has been delayed for various reasons, but photos from the manufacturing process have been made available. As of early May 2016, the company was months overdue to ship to its Indiegogo backers, with some backers accusing Batteroo of running a scam.

TechnologyCatalyst suggested that the device could be useful “if Batteriser was honest about its product”, not to prolong battery life but to stabilise voltage over its lifetime.

So I think the other comment is reasonable. Rechargeable batteries (ex. People mention Ikea ones and Eneloop) are pretty good now so people that want it can go for those