Do you know this for sure, about all the unavailable capacity being at "the bottom"? I haven't seen anything official from Ford, but I personally assume the FFE both saves a percentage at the bottom that is unavailable to the driver, and also saves a percentage at the top which cannot be filled. Since Ford has appeared to take a maximum battery life approach, and the FFE manual and Ford's web materials repeatedly recommend plugging in whenever possible, I wouldn't think it would be "allowed" to potentially sit long at a true 100% charge state since that's not ideal for battery life.WattsUp wrote:Not quite. You may be thinking about the fact that EV systems are programmed to discharge only about 80-90% of the total battery capacity. That is, while the batteries are indeed charged to their full capacity, they are never discharged past 10% charge remaining. This is because a complete discharge (to 0%) could cause damage.
The battery pack in the FFE has a total capacity of 23 kWh, of which the car will only ever make use of about 19.5 kWh (which is about 85% of the total). At the point where the FFE indicates that the battery is "empty", it still actually holds a charge of 3.5 kWh.
I don't know for sure. You may be right... it is possible that the car doesn't fully charge the battery either, and the 19.5 kWh of usable charge actually occupies the "middle" of the battery's total capacity range. But, we do at least know that only 19.5 kWh of the total 23 kWh capacity is available for normal use... from a usability standpoint, it doesn't really matter whether it comes from within the battery, eh?dmen wrote:Do you know this for sure, about all the unavailable capacity being at "the bottom"?WattsUp wrote:At the point where the FFE indicates that the battery is "empty", it still actually holds a charge of 3.5 kWh.
blavenn wrote:I have a 2012 model purchased in July last year and used to have 19.5kw of usable capacity and now its dropped to about 17.5kw all of a sudden the past few months after I hit about 12k miles or so. I'm wondering if the computer has something to do with it bringing the capacity down that much since there's been updates for the car's systems since late last year. took it to the dealer to get it updated but they failed to complete the task which is a whole other story.