It would sound impossible if someone claims to have a technology which can instantly tap more energy from dead/discarded batteries and extending their life by up to 8x. A new crowd-funded project claims to do exactly that and has already gone funded 777% on Indiegogo, Batteriser is a micro-thin, stainless steel sleeve that extends your battery's life by up to 8x. The already patented technology extends the life of batteries and taps into the 80% that was previously unused. Batterisers are reusable on new and most “used” batteries and will be available in AA, AAA, C, & D. Sounds too good to be true, just have a look at various scientific tests done in videos shared below to believe it for yourself.

Batteriser is an intelligent voltage management and delivery mechanism device made of thin stainless steel that slips over your battery and fits neatly back into your device's battery compartment.

Significant number of batteries thrown away still has a lot of energy left in them. Using proprietary circuitry to maintain an optimal output voltage, Batteriser allows the end device to access the untapped energy in the battery and makes it last longer.