We talked about this 4 years ago at least. I used to tell people don't charge it full all the time or don't leave it full, don't charge in the heat, don't park in the sun, don't drive it hard or stay in auto mode until flat, etc etc and for the old timers on here who remember I got people telling me I plug it in when I get home and don't worry about it, I drive how I want to drive, I park where I want, etc etc and I'm not going to worry about it because Ford designed the car and it should just work, plus I'm doing this every day and I don't have any issues with my battery. Search the forum going back some years and you'll find all these posts, some people practically laughed me out of the forum. I told them you won't see problems right away, but within a couple of seasons you should start to notice the difference. Now we got people who are down to the 3's in kwh output from the HVB, and they did what they did, I did what I preached to do, and my first 2013 Cmax HVB was still putting out around 5.4kwh at 70k+ miles and I even posted trip pictures to show that.
Anyway water under the bridge now, it is what it is. And in reality its not possible for the HVB not to wear out at all, they all will wear out, however, you can make the difference in how long the battery lastly based on how you treat it. The proof is here all in this forum. Only one guy got the HVB replaced under warranty, mipmapped I think his name was, and honestly he didn't do anything different with the new battery in the way of treatment and I read that the new battery has also lost capacity now and is quite degraded, so he didn't learn anything from the first incident if Ford kept replacing batteries under warranty they would be out of business.
You have the power to make the battery last or not, depending on the habits. I always try to think of what is better and what isn't, and try to do the best I can to prevent damage to the battery. When you do damage its all additive, so a little here a little there all of a sudden adds up over time to something you notice. Now that I have a new 2017 this time around I'm going to try to be even more critical of my actions to preserve the battery. For the first 5 years I did everything even without a scan gage, but this past December I got one so I can use it this upcoming summer to manage the battery better even though I did OK without one I know I can do better now.
I am in San Diego now and my 2017 sits in the garage with a deep cycle battery jumped to it so the 12v battery won't be able to get low, the HVB is sitting at only 30% and the car is not plugged in. Its always best to store the car with a lower charge level than leave it plugged in and store it at 100%. Alot of you guys know that now, but many of us didn't hence why I tried to preach to the crowd as best as I can to help.
Edited by rbort, 26 March 2018 - 09:59 AM.