[New Release] Mankerlight E05 II AL/Cu 1300 Lumen Highest Output Pocket EDC Flashlight in 14500/AA Class

Regarding the battery from a non fanatic. just an old collector.

18650’s do 99.9% of all battery requirements,
up to the real high output hand held torches.

Those. would be better served (I think) with the existing 26650’s.
Which I also prefer with a larger? stronger light.
Hand gripping wise.

They give Higher capacity. Longer life. With a more comfortable grip in my hands, which are average sized.

WHY go backwards for some novelty?
I can’t see there being much actual extra power\longevity in realtime from a 20700. over a top quality, high capacity\output 18650 cell 3600 to 4000ish, on paper, (with 5500mA in a 26650)
for the costing it would take for a changeover to.
IE Not enough extra anything.

ALL I do is take a spare battery in my pocket. (simple).
With a clear S2+ or little Jetbeam Pro as backup in other pocket.

On longer walks I have the choice of 3 x 26650 cell torches.
2 of them are optional battery 18650\26650.

This is not 20700 but 21700.
The top of the line 18650 are actually like 3200 mAh at reasonable current (3A to be precise).
The top of the line 21700 are actually like 4600 mAh at reasonable current (3A to be precise).
The top of the line 26650 are actually like 5600 mAh at reasonable current (3A to be precise).

21700 light weighs much less than 26650 making a nice middle option.

And, BTW, I tend to think that lights smaller than 18650 are more than 0.1% of the market.

As far as I know, this 20700 (later changed to 21700) was first made based on Tesla’s huge order. The engineers at Tesla found 20700 to be the optimum size with less total empty spaces between battery magazines. The idea is to make it easier to produce at cheaper manufacturing cost using existing cylindrical form factor from existing manufactures. Cylinder also much stronger than square design in regards to safety.
I read about this somewhere in the net about two years ago.
So, I think it’s driven by Tesla’s huge demand, not necessarily because 18650 getting obsolete. I predict we’ll see 18650 and 21700 to be the most popular battery size in the future.

- Clemence

20700 and 21700. These batteries are for electric vehicles, power tools and powerwalls. But since they make them we use them.

That’s some really nice spacing.

We talk about the 21700 quite a bit over here.

There is no magic to them, it’s just bigger and made by major battery companies. The 26650 size is not.

Just some notes:

The volume of the 21700 is right around 50% larger than the 18650, yet it doesn’t seem that much bigger.

The Samsung 30T is a beast of a cell. Only 3,000mah, but it’s internal resistance is about 10 to 12 milli ohms and can do 40A continous!

On the other extreme, the Samsung 48G is 4,800mAh and can do 10A continous (although for max life span they recommend 5A continous).

Cells like the 26650 Liitokala 5000mah blue and black can match the 48G in mah, but it can deliver 20A continous.

BTW, the 26650 volume is around double the 18650, but it’s not made by any of the big battery companies which is why we don’t see the same high level of “power density” such as a 7,000mah version.

It’s not going backwards, it’s going forward in a thinner cell.

Besides better capacity than an 18650, hand gripping wise it will be a more comfortable grip in my hands (vs 26650)

On some lights with a smaller head 26650 feels okay in the hand to me, (Thrunite TC20, EagleEye X7) but for lights with a larger head I usually prefer a thinner tube, I don’t hate 26650 on larger head lights with, but I think 21700 will be about perfect because 18650 is a bit thin for those.

So the “hand gripping” element is quite subjective and depends on personal preference, since there’s not many 21700 lights (yet) I’m happy Manker made this for 21700.

Small size big capacity has been the trend of technology advancement for decades. I hope the same doesn’t apply to our planet

- Clemence

The 21700 is not a technology advancement, if that is what you were implying. It’s just a different sized container.

I’m highly optimistic in the near future the capacity of 21700 will equals to current 26650

I am as well.

It's because 21700 cells will be made in Japan and all current 26650 cells are made in China.

As long Ultr*fire doesn’t take the contract to make the 26650 then the future sale of 21700 will be bright. Otherwise there soon will be fiery 12.000mah 26650. Even Elon Musk will give up competing against them.

- Clemence

Okay, so you believe Tesla when they say they will make a breakthrough in chemistry and have their 21700 cells achieving 5700-6000mah?

It’s a little hard to believe they will beat the big 4 of Sony, LG, Samsung and Panasonic. The current highest capacity is around 192mah/mm3. We will see if Tesla can reach 240mah/mm3. To me it’s seems doubtful, but given enough time it might happen.

Well, it was hard for me to believe Cree would hit the 150 and then 200 lumens/watt in real world too.
Not just time needed, he needs more moneeeey. Loads of them.

- Clemence

I don’t pay much attention to emitter efficiency. What emitters are doing 200 lumens/watt?

This was 4 years ago:
http://www.cree.com/news-media/news/article/cree-announces-next-generation-xp-led-delivering-200-lumens-per-watt

Omg. So no new advancements in 4 years?

Samsung does 220 lm/W. In mid-power LEDs.
We’ve seen similar efficiencies with high-power ones at mid-power currents. Actually even higher, though our measurements are not accurate enough…

Tesla is Panasonic in terms of technology. Well at least that is their base, but likely they share new tech also as Tesla did hire some battery engineers directly. As of right now Panasonic is still heavily invested in Tesla.

I don’t think it’s a matter of beating those 4 but using them. Lots of money involved here, those 4 are going to bring it up or work in some combination. The winner gets the contracts. Tesla is currently using Panasonic. However the military, and private sectors have also increased the demand for better. Improvements through joint ventures have been done before. The bonus is we get better batteries.