Tesla didnt change it universally. The LFP in the standard 3/y remains the same.
Only the TERNARY batteries are changed. Those with N C or M or A type materials.
If you understand the basics of ternary battery degradation in capacity and power loss, youll understand why Tesla did it
1. SoC matters allot. This calendar aging matters way more than cyclic aging. SoC should be as low as possible. There is a pain point beyond around 55-60% (depends on the mix of N C or M or A in the cathode chemistry) with going higher
2. The temperature @ SoC matters allot. Should be as low as possible. In sub freezing conditions embrace the chill the capacity loss is not permanent its eliminated on normal temps again.
3. No harm is done at 20, 10, 5% SoC. Tesla fudge it all anyway, the displayed SoC is not true SoC so even @ 0% you wont be empty. You cant actually make a Tesla battery truly empty - there are emergencies in place to prevent it, it will disconnect the HV bank before. Same with Tesla display of 100% SoC - it isnt 100% its more like actually 95% true SoC. Why? Because again Tesla do idiot proof and protect the battery bank its a big costly assembly in the vehicle - amongst the most costly assemblies. So automatically by having a Tesla you wont be ay 97% true soc and you wont be at 2% true soc ever.
4. If your diving use case means you must have the range above 55-60%, then optimum is too time the high charge level to when you are departing so the actual volume in time of high SoC states is minimal
5. Tesla have some idiot proof stuff. Like, you cant fully deplete the HV bank itll cut out before. Consumers like sentry mode get turned off at lower SoC points. You cant over charge the bank and therefore over heat the bank from this either. If you are an abusive owner and your always doing high rate fast DC charging, Tesla will on their surperharger network, mark your VIN to ensure DC charging on superchargers is at a de-rated level for the sake of battery life.
6. Keep your vehicle on charge with the SoC goal manually set especially in hot climates. Cool the battery on AC. In extreme heat find shelter plug it in.
7. C rates. Ternary batteries dont like C rates that are multiples. Like 2C, 3C etc. So LR/P 80kw approx bank, 160, 240 kw etc. Fractional C rates are preferred. So 50KW, 22KW, 11KW, 7.4KW etcetc
8. Shallow depth of discharge. Meaning, plug it in. charge. multiple times. Avoid deep discharge.
9. Generally, calendar aging is mostly important with where the SoC is most times over 24 hours 7 days 52 weeks etcetc and the environmental temperature. C Rates and cyclic aging are nice to haves but not as important as the calendar age factors.
10. Never overheat the battery at the track
But all this said, in ternary batteries you can pretty much do whatever random clueless stuff you can imagine and still be OK all and all for the warranty in Aus @ 70% remaining of original. So if your not keeping the vehicle and not preserving it for the next owner, none of it matters. Charge it to 100% and only on superchargers and Tesla will do things to those hapless owners all the while they wont ever notice Tesla have derated them on dc fast and done other things to prevent a bank replacement. Tesla dont want to say anything and not have any rules and just have it cruisey and simple. It really isnt, but thats marketing for you. Tesla is very very good at cooling their batteries and very good at how they manage the systems to protect the battery.
