GrowingTuna said:
3. Battery degradation seemed to correspond to ambient temperature more than how I treated it.
Correct. Trying to peppy the battery makes almost no difference in terms of Rapid Unscheduled Degradation.
L1; L2; L3 - doesn't matter. Few hours 10 degrees hotter due to QC session - doesn't matter.
It's my understanding that the damage from high SOC comes when you are charging the battery to full or nearly so.
No. This only has a cycle degradation. This is hardly a 1-2% per year (that is what my Leaf does mostly).
Damage happen not due to charging, but due to cells being charged.
50% charged is better than 60%, is better than 70%, is better than 80%. And anything above that is already charted territory.
When you got your Leaf, BMS did not recalculate SOH, Hx values. It requires considerable discharges for BMS to notice capacity.
BMS calculates battery capacity looking at the voltage while counting how much juice has been used/added. Above 50% charge
state voltage is pretty constant. Therefore no good capacity valuation can be done.
When you got your vehicle, it was already degraded. BMS just didn't know that. Until you showed it to BMS.
If it wasn't a lease, I would return the vehicle immediately. Because it was not stored according to manufacturer's recommendations.
Though now you know what will happen with your vehicle, if you charge it to 100%. Add around 1-2% extra degradation due battery cycling to that two digit number and you get expected degradation when used and immediately charged to 100% when not.
PS: 100% on a Leaf is around 4.14V. 100% on a Tesla is 4.2V. Tesla's 100% selection defaults back to 90% after some period.
Nissan knows that their battery is s*it in heat. They don't even allow higher SOC to begin with.
We, (you guys in hot climates), can only voluntarily go lower.
Bottom line: Without fully characterizing (extensive analysis) the Leaf's cell, suggestions relating to charging are basically speculations.
BS. You don't need to have extensive analysis of banana yoghurt shelf life if you have that analysis for cherry yoghurt just to estimate
how long will it last in a fridge and how long next to keyboard and mouse :lol:
Definition of
speculation is
"the forming of a theory or conjecture without firm evidence." We have evidence that milk products spoil faster at room temperature compared to fridge. We have evidence that Leafy flavor spoils faster than Musky flavor.
There are joghurts that do not spoil, but our version definitely does spoil.
Suggesting keeping joghurts in the fridges is transparently sensible. Suggestion to charge to lower SOC also.
Flavor plays a role at the rate. Not on the direction of capacity slip.
What is on the other hand speculation, is that keeping Leaf's cells at 3.0V will degrade them faster, compared to, lets say 3.1V.