For example, we know that the latest cells could give a near 400 mile range. I'm sure there are owners - possibly the same group as the early adopters - that would pay big money say they have that, providing a revenue stream for Tesla while keeping them way out ahead of the pack.
Many of us have had sheets replaced and the new batteries have to be balanced to match the others in the pack. Maybe it will be an all-or-nothing choice on going to a 400 mile pack.
Ignoring Roadster battery issues as they begin to "fail" would certainly make Tesla look bad and would certainly give EV haters a field day.
The world loves to be deceived.
That's one benefit of building your own I can indeed pull out any single 100 amp hour cell and replace it fairly easily, one reason most of us DIY types don't use the higher density but more difficult to build with 18650 LiCo cells. However you wouldn't want to stick a single cell with different specs into the pack as it would make management difficult, though not impossible. Actually as long as it had the same voltage range and had larger capacity than the other cells it wouldn't matter too much. It would just have an easier life being shallow cycled compared to the others.
The challenge with a Tesla Roadster battery is a DIY cannot fix or upgrade them unless one wants to spend a significant amount of money in a proper spot welder. Assuming you overcome the small issue of extracting the existing 1000lb battery from the underside of the Roadster. My understanding is there are two welds holding each battery so that is 13662 welds. That is well beyond my capability and I assume the majority of DIY. The larger format Prismatic cells are relatively easy to work with but matching the size and capacity of the Roadster capacity again will be impossible. But I would not think it would be difficult for Tesla to offer an upgraded pack as the newer higher capacity cells are the same voltage and size. So they should be able to easily swap them into the existing manufacturing process. Then I would think it would be an easy firmware update to reflect the larger capacity.
Battery Prices for Electric Vehicles Fall 14%, BNEF Says
LarryThe average price of lithium-ion battery packs for electric vehicles fell 14 percent in the past year as production capacity exceeded demand, Bloomberg New Energy Finance said.
Batteries cost $689 a kilowatt-hour in the first quarter of 2012, compared with $800 a year earlier, the London-based research company said today in a statement.
Prices for batteries have dropped 30 percent since 2009, making electric vehicles less expensive.
Yes, yes, cells do not make a battery. But again with scale the rest of the battery electronics will be a lot less than $389 per kWhr - making a combined total a lot cheaper than their quoted $689 per kWhr.
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