I think that I’d love a 40700 size cell in a small fatty flashlight with immense output or immense runtime at low modes, makes a nice lantern too.
as far as springs, sure, they’ll just have to be a bit ungraded. this is my 10A switch for 200w hotwire, switch was built by matt from ASF.
New pics seem to confirm the new format
They say that it is double the diameter of current Tesla cells (21700)
Drew this quickly with 42mm diameter :
Without play :
3x18650 : 38.8mm
4x18650 : 43.5mm
3x21700 : 45.4mm
4x21700 : 50.7mm
I have found a 40900 cell on Taobao: https://item.taobao.com/item.htm?spm=a1z10.3-c-s.w4002-21513148700.70.667c7b3dkSz6t0&id=593991411207
It is pretty inefficient, though, with only 5.5Ah. But it has only 2 milliohms internal resistance. Seems to be made for car starters.
Interesting. This is a huge news if true. Fortunately we’re likely to learn whether it is in just a week. So I’m waiting patiently.
Similar sized batteries in LifePO4 chemistry that where available over a year ago.
I mentioned them here.
Its a 5498 cell, 10x the energy of a 21700. Floats in antifreeze to warm and cool cell.
One of these cells in the blf-lt1 would give a 2 month runtime.
https://www.youtube.com./watch?time_continue=5&v=QQY2vYhysBY&feature=emb_logo
The difference is that:
- they are LiFePo4
- their energy density is terrible when you compare with the good 18650 and 21700 cells
- they are being made by small manufacturers which greatly reduces the chances of being adopted by flashlight makers
They have 10x a 21700 energy. Tesla will use battery pack 1/10th the current size. How is that terrible density? Not understanding ?
It has a catalyst electrode and drops into a pack. Levels of magnitude better then 21700. New teslas built with this 5498 cell will cost msrp 29k and have 300+ mile range.
I will buy one and charge with my solar array and drive for free.
If it’s 54 mm diameter, a host will need a handle to be comfortable. 
I was replying to an earlier post.
I already added a quotation to make it clear to others.
You must have small hands. I was hoping for a headlamp. :partying_face:
It seems that the number 54 comes from “FX054” marking on the can, that sounds like a very wild guess if you ask me, granted it looks bigger than 40700 unless those are small hands.
The bad news is now what will happen to the 21700?
That comes from the twitter guy cited in the video, unless I missed something else (video is such an annoying format, just write an article).
And there are rumours the new batteries will be LFP.
I hope they make packs available to solar off grid users. It would be awesome to have a 100kw pack.