Answer: Neither. To prolong the life of the battery it is best to keep it in the 20-80% range (2 bars - 10 bars). The higher the state of charge and the longer it is at that higher state of charge, the worse it is for the battery. That is especially true if battery temperature is elevated (middle of 6 bar temperature range to 7 bar temperature). If you don't need to do it for adequate range, NEVER charge to 100%. If you need to charge to 100%, it is best to have the charging finish shortly before you plan to drive the Leaf (e.g., charge to 100% by 7:00 AM if you plan to leave at 7:30 AM).mpm3710 wrote:So my question is is it better to keep topping off the battery than to wait and charge it when close to depletion to prolong the battery life?
I totally agree with your points here. Unless you know at the time you start recharging that you're going to need 100%, you'd only want to charge to 80%. But if your plans change and you end up needing 100% later, you should be able to charge to 100% from 80% without penalty. The logic for the penalty is flawed, because it's actually better to keep the battery on standby at 80% then charged to 100% just before you leave, than to keep the battery on standby at 100% the whole time.TimLee wrote:That's the only category I only had 4 stars in too.
In one year of operation, I think I charged when the battery was >80% (10 of 12 bars), on about 3 or 4 occasions.
And it was only when I needed to for reaching my destination and it was right before I headed out and very quickly brought the battery charge back substantially below 80%.
I think their evaluation protocol on this category is a bit picky.
Kind of like it is OK to charge to 100%, but decide that when you first set up the charge.
If you find out later that you need 100% when you previously thought 80% was going to meet your needs, you get dinged for the latter. I really don't technically see how one versus the other has any different impact on the battery life.
Total # of times that charging to >80% has been selected would be more relevant indicator of impact to battery. And then its a matter of how long you leave the batter at >80%.
Key to extending battery life is avoiding leaving battery <20% or >80% for any significant length of time, especially in hot weather.
dinged is not a word i would use. like any "rule" there are usually circumstances that applies to the rule that do not apply to you and this is one of them.LEAFer wrote:SO ... am I interpreting this correctly ? It means you are also being dinged when you try to do the right thing: charge on End-Only-Timer to 80%, and 90 minutes before you leave hit the timer override to get to 100%.