It actually has to do with the battery in terms of solution more than the charger itself:

The battery uses aluminum-ion cells, which are much cheaper than lithium-ion. They’re also high performance and are not prone to bursting into flames or exploding when damaged, as lithium ion batteries can do.

The current prototype produces about 2 volts, which is less than the 3.6 volts from a conventional lithium-ion battery, and its energy density—the amount of electrical energy stored in a given unit of mass—is also lower. The aluminum-ion battery developed by Standard has an energy density of 40 watts per kilogram compared to between 100 and 260 watts per kilogram for lithium ion.

Seriously I can’t wait for them to come out with this.  Even my own iphone 4 battery went out and needed to be replaced through no fault of my own.  That took a trip to the apple store and $80.  Many of you have had similar or related experiences.

thank you for the insightful post by Martyn Williams of PC World