LEAFer
Well-known member
In response to SanDust:
Regarding use of the generic 18650 term: this is a mechanical spec (18mm x 65 mm). It tells you nothing of the chemistry.
Roadster ESS (battery pack): is indeed quite similar to laptop batteries. But that's where the comparison ends.
1. A laptop has *NO* (read: ZERO) TMS; the Roadster has a VERY good, expensive and efficient TMS.
2. Most (older) laptops have zero or very POOR ( & cheap ) BMS. Those are (most likely) the laptops you are refering to and base your conclusions on regarding poor long life experience of their 18650s. The Roadster has a very sophisticated (expensive) BMS.
3. Tesla Motors, during its stealth mode (2003-2006) -- and beyond -- carefully studied the batteries they ended up with in the Roadster. They worked closely with Panasonic on the chemistry to improve it for the automotive application.
All of the above applies to the Model S, plus much more research and significant improvements and changes to the Tesla implemented chemistry, BMS and TMS.
The data presented to you more than once in this thread ... speaks for itself.
Regarding use of the generic 18650 term: this is a mechanical spec (18mm x 65 mm). It tells you nothing of the chemistry.
Roadster ESS (battery pack): is indeed quite similar to laptop batteries. But that's where the comparison ends.
1. A laptop has *NO* (read: ZERO) TMS; the Roadster has a VERY good, expensive and efficient TMS.
2. Most (older) laptops have zero or very POOR ( & cheap ) BMS. Those are (most likely) the laptops you are refering to and base your conclusions on regarding poor long life experience of their 18650s. The Roadster has a very sophisticated (expensive) BMS.
3. Tesla Motors, during its stealth mode (2003-2006) -- and beyond -- carefully studied the batteries they ended up with in the Roadster. They worked closely with Panasonic on the chemistry to improve it for the automotive application.
All of the above applies to the Model S, plus much more research and significant improvements and changes to the Tesla implemented chemistry, BMS and TMS.
The data presented to you more than once in this thread ... speaks for itself.