But the technology still has limitations: It is costly, it delivers about 1/40 as much energy per unit weight as petroleum, and if overheated or overcharged, it could burst into flames. (discovermagazine.com)
However, while expressing VO2max on a per unit weight basis will control for differences in total body mass, it does not eliminate differences in body composition (i.e. one person may be more muscular than another). (shapesense.com)