CREATE TABLE table_name_44 (volts VARCHAR2, energy_to_weight_ratio VARCHAR2)

How many volts has an energy-to-weight ratio of 54 kj/kg to 2.0v?
SELECT volts FROM table_name_44 WHERE energy_to_weight_ratio = "54 kj/kg to 2.0v"
SELECT "volts" FROM "table_name_44" WHERE "54 kj/kg to 2.0v" = "energy_to_weight_ratio"