Correction to: Polytechnica

https://doi.org/10.1007/s41050-018-0003-3

On p. 5 of the published article, in the last paragraph and in the Fig. 9 caption, “9000 kWh/L” should be “9 kWh/L”. An additional correction is needed in the Fig. 9 caption, wherein “5000 kWh/L” should be “5 kWh/L”.