Originally Posted by
green granite
As the electric car guy said, switch to round, true single-cell batteries, this would overcome the possibility of 'sub-cell' failure.
According to
Tesla Roadster - Wikipedia, the free encyclopedia their battery pack has 53 kWh capacity at 375 V and weighs 450 kg. 787 battery has 2.2 kWh at 29.6 V and weighs 28.5 kg. So as soon as Tesla's battery gets downscaled 24-times while handling different voltage and the currents for starting APU and gets certified for aircraft it can be readily used. 2015, maybe?