Battery Life Extender (was check this out)

[Skvez]

There are a couple of big caveats with this technology.
Yes the battery drops fairly quickly from 1.5V to 1.4V
But only a few things stop working at 1.4V, most products keep going down to 1.2V or lower.
If this were not the case rechargeables wouldn't be useable in any of these products.
So you can expect to see big life improvements on only a few very-voltage-fussy items.

It would make much more sense if this technology was integrated into the power supply of the device itself instead of the battery, and in many cases this is in fact the case.

So useful, perhaps for a few items.
But imagining your batteries are all going to last 8 times longer ... alas no.
Typical battery discharge Voltage curves tell me you might get an extra 10 or 20% out of your batteries, but an extra 800% is just not rational.