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Originally Posted by aturnis

18650 only indicates the form factor. 18mmm by 65mmm cylindrical. They've switched to 2170 for the model 3, and possibly the energy storage, Semi and Roadster as well.

The true difference in battery tech is chemistry for both performance and cost.

I honestly don't think anyone will be able to compete. As noted in the call, Tesla has greatly reduced the need for cobalt in their batteries, and see a path to get it to almost nothing. This is HUGE for cost as prices have been trending upward.

If other automakers intend to go 100% electric, which they all do outside out Fiat and Toyota(sorry gearheads), they'll likely be putting prismatic cells in their cars to get the volume they'll need and to save on weight and shove batteries wherever they find space.

Problem is, cars are a terrible place to use prismatic cells. This is typically what traditional OEM's use though. They favor larger cell sizes and less connections. The problem is, they degrade faster, and if a single cell goes out, it can make a HUGE difference to performance/range.

Basically, when you hear the worn out adage of, "you'll have to replace the battery after 10 years, if it makes it that long"!, they are referring to prismatic cells. The vibrations of the road make the bagged chemistry shake itself apart faster. Other problems are losing a single cell is significant, as I said earlier, and they can be easily damaged/punctured in a wreck. Which of course can be dangerous.

This is why I'm not too worried about all other OEM's going electric. It might effect the stock early, but once the public understands the ins and outs, or OEM's have their reputations ruined by going with a poor solution, Tesla should remain out in front.

Yup, I'm familiar with the terminology. I'm counting on battery companies to keep my vaping gear operational. It's 21700 by the way rather than 2170. I currently use the LG HG2 (18650). The Samsung 30T (21700) has been tested and rated by an electrical engineer at 3000 mAh with a continuous discharge rating of 35 Amps. Not bad at all if you want a good, safe battery. By the time I swap away from 18650's I should be sitting pretty.