I'm guessing that many of you have already seen one of these, but I searched and couldn't find a pic anywhere so figured I should just post one:
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(from 2008)TEG said:I just took this photo comparing 18650 cells (from a flashlight) to more common AA, C and D sizes.
Is that like a bad joke that the Li-Ions are called "UltraFire" with a logo of a burning fire?!
Nigel, nice picture, but you should have put the other side of the scale near the cell! (65mm after all) :smile:
So that's why the Roadster sells for $140,000!JB goes to Japan and gets them one at a time from Panasonic
So that's why the Roadster sells for $140,000!
The roadster pack is 56 kwh....Using this math: 53000kWh/(6831*3.6v) I get 2.1 AmpHours per battery. Does anyone know what the ratings of the batteries actually used in the Roadster is - I haven't seen any 2.1mAh, just 2.2s.
You can buy these 3.0 AH 18650s for $3.50 each in quantities of 2. Imagine the price when you're buying tens of hundreds of thousands. That would add 36% more range, or 333 miles for the Roadster.
Here's a link to a Panasonic Data Sheet for the 3.0 Ah 18650s.
Any chance Tesla would use something like these in a few years for Roadster replacement packs?
(Sorry if this has been covered elsewhere, I did try searching, but it doesn't do so well with numbers)..
I suspect that the new cells in the 300 mile model S pack will be 'next generation' with higher energy density.
53000 kWh would be 53000000 Wh. 2.1 mAh would be 0.0021 Ah.Using this math: 53000kWh/(6831*3.6v) I get 2.1 AmpHours per battery. Does anyone know what the ratings of the batteries actually used in the Roadster is - I haven't seen any 2.1mAh, just 2.2s.
Based on information from other threads here, the batteries are charged to 4.1 V for standard mode and 4.15 V for range mode. That brings the performance down to 2.0 Ah or 2000 mAh.
53000 kWh would be 53000000 Wh. 2.1 mAh would be 0.0021 Ah.
qwk has already pointed out that the first constant should be 56000 Wh. Based on information from other threads here, the batteries are charged to 4.1 V for standard mode and 4.15 V for range mode. That brings the performance down to 2.0 Ah or 2000 mAh.