Density is volume (three dimensional space) to energy capacity.
Lithium is light weight. So this battery must be about 5 times heavier than a lithium battery of the same physical volume. At least that what it takes to make the article make sense...
It has to be refilled with fuel - sugar. It releases electricity, water and CO2. Getting rid of water with a phone seems like a problem... Not for a car though...
Good point. Though....
...lithium is about half the density of water.
Assuming that the sugar is in a water solution (don’t know for sure), that means that the same size sugar battery would contain 5 times the energy of lithium ion.
Not if it's water vapor. Although temperature conditions might seem to be an issue. Condensation, freezing and all that.