NorthVanFocus wrote:I've had my FFE for nearly 4 years now, and I have recently noticed a massive decrease in my range. The dealer says this is normal, but I do not understand how a battery can deteriorate over 40% and still be considered normal and acceptable.
The range estimate and battery capacity can often have no correlation. The range estimate is just a computation... based (partly, yes) on battery capacity but also your rate of energy consumption (measured from past trips).
Has your rate of consumption drastically increased recently?
- Is the weather very cold?
- Are you using the climate controls heavily?
- Are you driving a new route with more inclines now?
- Are your tires very low on pressure?
But, perhaps most tellingly... what is your average Wh/mi? If you don't know, reset one of the trip meters and then let it accumulate, say, at least 100 miles (maybe more) by driving your normal routes. Then, see what the average Wh/mi is.
There is also a way to measure your actual battery capacity (independent of range estimate), by performing the "heater run down" test.
To perform the test:
1) Fully charge your car.
2) Turn it on and reset one of the the trip meters to zero. (Also make sure the meter is in "advanced" mode, so it will display the total kWh used.)
3) Turn on the climate control heater at "HI". (Probably also leave all the Windows down.)
4) Leave the car for a few hours until the battery is empty and cold air is blowing. (Probably best to check on it every hour to make sure all is okay, but the entire test WILL take a few hours.)
After you complete step #4, the trip meter will be displaying the total kWh used for the "trip", which will reflect your battery capacity.