It's essentially a voltage booster that sucks every last drop of useable energy from ostensibly spent batteries. So, instead of using just 20 percent of all the power hidden inside of your Duracells and Energizers, Batteriser makes effective use of the remaining 80 percent. Voltage boosters are nothing new, but Batteriser scales down the technology to the point where it can fit inside a stainless steel sleeve less than 0.1 mm thick. Roohparvar says the sleeves are thin enough to fit inside almost every battery compartment imaginable, and the combined package can extend battery life between 4.9x for devices like remote controls and 9.1x for various electronic toys.
Red flag: Phillips writes that the creator proved he wasn't selling snake oil by demonstrating the gadget for him, but there's no description of independent testing. Did the guy just play with it in front of you? Who provided the batteries? What were the test controls? Boosting voltage at the expense of amperage and getting 800% more operational time, really? Turned down VC because the "money trail" led to battery companies, in favor of Indiegogo? Consumers with mountains of nearly-dead alkaline batteries want to know!