Tesla battery definitely does not last nearly as long as people expects. I had battery (BATTERY, 12V, DCS33- 1.00UNCR, PRE-REFRESH(1083774-00-B)) replaced on my 2016 Model S by mobile service in 2022, and the same replace 12v battery alert comes back in less than 2 years/20k miles.
I brought this up to Tesla service and was told battery should last 3-5 years, but they only offered 1 year warranty for the repair which expired, and the battery that failed in under 2 years is consider a customer pay item. Per Tesla, there is no way to guarantee battery last more than one year even they 'think' it should last longer. Car was properly maintained and Tesla was not able to pinpoint the reason of the premature 12v battery failure either.
Another note is price, back in mid-2022 the cost to replace a Model S battery was $264.06 ($165.00 part + $84.00 labor + $15.06 tax), in couple years the price becomes $291.36 ($165.00 part + $111.30 labor + $15.06 tax).
On a separate note, in the 2022 visit the Mobile tech managed to remove the battery just by taking out the side and top side, and got done in under 20 minutes, so this should be a good DIY project for those who got hands on experience.
That being said, may I ask for any suggestion for Tesla battery replacement (C&D type)? So far the only suggestion is Ohmmu but there seems to be mixed reviews about it. I am somewhat hold back to Ohmmu battery due to:
1. cost more than double to the Tesla battery
2. there may be an issue with low temperature (although I am unable to confirm how 'low' is consider too low of a temperature to cause the BMS to act up)
If anyone has any other suggestions it is greatly appreciated to share, particularly the experience of other 3rd party battery that may yeild better performance/longivity/value.
TIA!
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