I have a 2022 RWD LFP at 8434km, started at 439km new, my 100% only reads 426km now. It was 428km in June
Initially did a lot of supercharging, due to credits, to 80% and finishing with Lvl1 or 2 to 100%
Now mostly Level 2 charging to 100% once every 2 weeks at most.
Never let my SOC go below 20%, I don't have a home charger and don't use sentry at home, so it does go to deep sleep. Not sure what i'm doing wrong charging habit wise.
Lifetime wh/km is about 140ish. I thought the summer efficiency would bring my range estimate back but it just keeps getting a little lower.
There seem to be a thinking that the new LFP batteries should not degrade.
- LFP degrade less than NCA/NMC specially when doing large cy les with 100 to 0% cycles. They are relatively non-sensitive to large cycles (which is good as smaller batteries most often need to use bigger cycles).
- ALL LFP that have been tested in research have about the same behavior for calendar aging. We do not know for sure as the latest tesla LFP’s of course have not dome a two year calendar sging test yet. We can assume that the new LFPs also suffer from calendar aging. Maybe slightly reduced but it modt certain still eats from batteries.
As LFPs is quite non sensitive to cycles and can do a lot of them, we will not see much degradation from the cycles( or mealsge of the car). The cars age, environment with ambient temperatures and probably the SOC also will be the factors deciding the degradation tempo.
Tesla need owners of LFP Cars to charge to 100% regularly to help the car to keep track of the energy content in the battery. There is otherwise a risk that the car/BMS looses track of the actual SOC, thinking the car has more remaining than it actually has and getting stranded as a result.
This is the real reason that Tesla recommends charging to 100%. The reason is not that the battery has the lowest degradation if charged to 100%.
Calendar aging will be the biggest factor for degradation and real range loss. After the first year of owning a LFP Tesla there will be a range loss and the absolute main part will be due to calendar aging (as cycles, even big cycles to 100% cause very little wear).
There is no danger going below 20%.
In fact the battery wear the least if it is at low SOC ( down to 0%) as calendar aging is lower the lower the SOC is. The ”below 20% is a forum or internet myth, that many people bought.
