I monitor this thing very closely tabulating every watt-hour.
While I have no proof regarding the “health” of the battery, I have proof the range gauge, the “guess-o-meter” gets worse and worse the longer you avoid 100%.
The car only “knows” you have 60 kWh at 100%.
(Or conversely, knows you are at 0 kWh at 0%.)
When operating in the middle, it is always a guess.
I estimate up to 0.5% error on the guess-o-meter for each day of driving without a full charge.
Yes, once I went 30 days in a row of partial charges and partial discharges.
When I finally let it go to 100%, it took 15% more power to reach 100% than it should have. Meaning my estimated range was 15% higher than actual. No good if I were attempting a long trip that day.
ALWAYS charge to 100% before attemping a trip that will use 75% or more of your battery charge.
GetOffYourGas wrote:IMAdolt wrote:It's generally excepted that you should charge it up full (100%) and run it down low (not 0 but low) once and a while, not to make a habit of it but like every couple months or a few times a year? To make sure everything is getting a chance to balance properly.
Honest questions - Who recommends that? And what do we know about how Chevy balances the cells in the battery?
We know about Leaf batteries because many people have done deep dive studies, watching the cells balance, etc. Have there been studies into the Bolt's battery? Has GM or LG said anything official? Or are we just extrapolating from other vehicles' behavior?
We do know some things about lithium batteries, which applies to some extent to all chemistry variations. For example, sitting at a very high or very low SoC is stressful and causes degradation over time. Also shallower charges are less stressful than deeper charges. For example, charging from 25-75% twice is much easier on the battery than charging from 0-100% once.