Regen in cold helps build up lithium plating. it's still high C charging to full voltage and Tesla wasn't managing it's charge thermals safely, which is a well documented way to produce battery fires. They might be able to bring back Regen later but they're still worried about cars that were damaged by the bms' old settings, and since they aren't replacing the damaged batteries their abundance of caution grows in scope every so often.
These fires weren't about 4.2v, that's just the fastest way they could hide the safety problem. They were causing lithium plating to build and short circuit with multiple BMS settings interacting in ways they didn't think about the effects of constant use for years.
These fires weren't about 4.2v, that's just the fastest way they could hide the safety problem. They were causing lithium plating to build and short circuit with multiple BMS settings interacting in ways they didn't think about the effects of constant use for years.
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