I can't imagine weight would make a difference. The whole pack is only a couple hundred pounds so cutting it in half would have little effect on mileage. The real difference would probably be in the size/power ratio. In other words, a battery of equal size and weight but with far more power.

-Tim

2006 Mercury Mariner Hybrid AWD
Black with Pebble interior
Premium Package with Nav & Moonroof



Current ODO: 26,152
Typical Drive: 20 min crosstown in heavy traffic (3.5mi there and back twice a day)


532 Gallons of gas saved
That's 10,642 lbs less CO2 emitted