Manufacturers rate batteries in watt-hours; if they rate the watt-hour higher, the longer the battery can be expected to last.
A.if they rate the watt-hour higher, the longer
B. rating the watt-hour higher, it is that much longer
C. the higher the watt-hour rating, the longer
D. the higher the watt-hour rating, it is that much longer that
E.when the watt-hour rating is higher, the longer it is