Batteriser is sleeve that extends the life of your batteries up to 800% Posted by riddl on Monday June 08, 2015 @03:38AM from the batteriser.com dept. http://www.batteriser.com/ ( 2 comments | 2 points | on HN )
Simple boost converter used to step up the voltage. If you run alkalines too low they leak. Plus the 8x claim is quite frankly ridiculous.
Just buy some Sanyo eneloops.