Wikipedia entity: Electric aircraft
Topics: comparison; technology; energy efficiency; aviation
Original sentence: That said, battery-electric motors have a higher efficiency (~90%) than most jet engines (~50%), which can be further exploited through emerging battery chemistries.To be feasible for electric aircraft application, it is essential that power storage be improved.
Quantified sentence: That said, while most jet engines have an efficiency of about 50%, battery-electric motors are usually more efficient, which can be further exploited through emerging battery chemistries. To be feasible for electric aircraft application, it is essential that power storage be improved.
Quantifier: usually
Percentage: 90%
Specificity: partially