I've only had the new battery about a week. I bought it with 9 bars six weeks ago for a steal because the range was about 50 miles and the used car dealership couldn't move it. They had no idea they could get a new battery under warranty. Now the GOM is showing about 120 miles in the morning after a full charge in ECO mode. After a month of driving the car as slow as possible and charging all the time it's great to finally be able to drive 80 MPH on the highway and not worry about charging until I get home.