Electrical engineer David L. Jones explains why claims made on behalf of The Batteriser–a gadget promised to get up to 8x life out of alkaline batteries–are nonsense.
The Batteriser is a really neatly designed product (apart from the shorting issue), I love the miniturisation technology in it, and I'll be buying some once it goes on sale to check out how they have done it. And yes, it can and certainly will work on some, perhaps many products and get some extra life out of it. But the 800% claims are demonstrably untrue, and unfortunately this is what every media outlet ran with. They took a blue sky marketing estimate and ran with it because it made a great story. There was no basic fact checking. All the electronics engineers who immediately questioned the claims were right in doing so, it's trivial to prove there are issues with even the most basic of engineering due-diligence. There are just way too many downsides and unanswered questions on this product. I'll guess we'll have to wait and see until they start shipping so we can get one and actually test it.
Just get Eneloops, civilian.