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.
