a lot of time it's not the battery that is low quality but the electronics that manage it.

batteries usually come from the same suppliers but everyone develops their own battery management.

if you either over-charge the battery or over-deplete or charge too fast etc. the battery will degrade rapidly.

this is actually one thing Tesla is good at. their batteries last longer than almost any other electronic device, even though their cells come from common suppliers like Panasonic.

Tesla knew that as a company they would not survive if their batteries didn't last because the battery is under mandatory California warranty and is the most expensive part of the car - so as reckless as Tesla is with human safety they are actually conservative with the way they manage the battery.

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there is a newer battery tech called LiFePo which is far more robust than older chemistries and is getting popular in Chinese cars but Western automakers do not like this chemistry because it makes for batteries that are heavy and have shorter range ...

on other hand LiFePo is far superior in every other way ... it's just that for carmakers weight and range are of such paramount importance that they would rather use batteries that degrade and catch on fire ...

i believe Porsche uses LiFePo only in their 12V batteries ( in regular gas cars ) as a replacement for lead acid batteries, because in this application ruggedness trumps weight and capacity. I heard only good things about these 12V LiFePo batteries in Porsches. They are far lighter than Lead Acid and they are bombproof. A replacement battery is about $600 but this isn't because LiFePo is expensive ( actually LiFePo is cheaper to make than common Lithium chemistries, which is why it is popular in China ), rather it's $600 simply because Porsche.

Porsche EVs and Plug-in Hybrid batteries still use traditional Lithium chemistries for lower weight and longer range.

I don't know what chemistry upcoming 911 Hybrid will use because unlike Porsche's current hybrids he 911 will NOT have a plug for charging.

without a plug range is not a factor and LiFePo is on the table.