3.11 energy round trip efficiency ratio of the net d.c. energy delivered by a DUT during a discharge test to the total d.c. energy required to restore the initial SOC by a standard charge Note 1 to entry: The net d.c. energy is expressed as watt hours (Wh) discharge and the total d.c. energy is expressed as watt hours (Wh) charge. 3.12 high-energy battery pack and system battery pack (3.2) and system (3.3) using cells, which have the numerical ratio between maximum allowed electric power output and electric energy output at a 1C discharge rate at RT lower than 10 Note 1 to entry: Typically high-energy battery packs and systems are designed for applications in BEVs and PHEVs. Note 2 to entry: The allowed electric power output is expressed as power in watts (W) and the electric energy output is expressed as energy in watt hours (Wh). 3.13 high-power battery pack and system battery pack (3.2) and system (3.3) using cells, for which the numerical ratio between maximum allowed electric power output and electric energy output at a 1C discharge rate at RT equal to or higher than 10 Note 1 to entry: Typically high-power battery packs and systems are designed for applications in HEVs and FCVs. Note 2 to entry: The allowed electric power output