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The number of charge cycles are a bit of a worry, 250 currently with hopes to get it to 500 in a couple of years. No info I could see about the level of degradation at those numbers.
 

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Bit worrying that the journalist is also confusing the term energy density (which is the amount of energy in a defined volume) with specific energy which is the amount in a defined mass.
One major advantage of liquid fuels is that the aircraft doesn't have to carry them once they are used, hence they use less as the flight time increases whereas with storage such as batteries is that the weight remains near constant unless they start designing the equivalent of drop-tanks on military aircraft and start ejecting used batteries during flight.
 
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