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.
Seriously exciting! But if it is manufactured in-house by Tesla, will it ever be sold in the after market?
Maybe no…but it starts the same as 21700. These cells were intended to be used by Tesla in their vehicles period.
Then they landed nearly everywhere…
[quote=idahofarmer]
They have 10x a 21700 energy. Tesla will use battery pack 1/10th the current size. How is that terrible density? [/Quote]
I don’t think the pack is going to be 1/10 the volume. There will likely be some packing efficiency improvements with the larger cell, but overall volume should remain similar. A 10x reduction in volume would require other worldly improvements in active material specific energy.
The point for them is $$ first. Fewer cells in an architecture with shared components will save time and money in production. I’m not qualified to even guess how much that may be, but I can say pretty confidently the energy density of the cell is not 10x current values.
I guess by “size” he meant “cell count” rather than “volume”.
I guess we will know possibly next week, here is another video posted just 16 hours ago. Talk about massive runtime capabilities in a flashlight! This would be a game changer in the flashlight world!
https://www.youtube.com./watch?v=jK_soSRgMkM
LiFePO4? Glad to listen at. LiFePO4 features an ultra-flat discharge curve, this means their drive trains' performance won't degrade as the battery discharges. This may not mean much in practice because drivers do not usually demand full engine power at all times, but it is worth saying.
On the other hand, hope this means someone with an open mind gets to improve LFP batteries energy density speaking. And when I say lads & lasses with an open mind, I allude to believers in everything's possible.
Because, in all honesty, lithium nickel and other classic “4.2V max” chemistries feature gradually diminishing output voltage curves, which was chosen to help powered device electronics measure battery state of charge (SoC), but it is a drawback in every other respect, particularly when high or top performance is required. Flat discharge curves or constant output voltage is considered quintessential by some (like me), as they model a voltage source. It also makes all available energy in a battery useable regardless of power output.
Providing an example to better ilustrate this, i.e. with a LiFe battery an electric vehicle will provide close to the same performance regardless of battery state of charge, versus with a li-ion battery, whose vehicle performance is sure to degrade as the battery gets discharged:
/Sony%20US18650VTC6%203000mAh%20(Green)-Capacity.png)
/LFP18650%201500mAh%20LiFePO4%20(Violet)-Capacity.png)
Or maybe they are using über boost-buck converters (guess not).
LFP needs improvements, in any case. Quite logical when you compare the relative development of LiFe by the big players (pretty scant) versus their development of all the remaining high voltage li-ion variants.
With three 40mm cells, with their wrappers on, the battery tube would have to be over 3.5 inches (90+mm) in diameter. Might make for a nice LT2 lantern. Imagine having a camp lantern that would last 3 weeks between charges? I’m in.
Just wondering, how do LFP-using devices ‘estimate’ state of charge, since the voltage stays mostly flat when getting discharged?