Test/review of Samsung INR21700-30T 3000mAh (Gray)

Welcome to the club Enveck! Perhaps alibaba? I don’t know about shipping and stuff, I just googled this. https://www.alibaba.com/product-detail/Sam-sung-3000mah-40A-3-7V_60668687455.html


Mooch tested and is using the 30T, just asked him where he got the cells.

Thanks, all I’ve found so far is Alibaba…. I guess they haven’t hit state side just yet. Working on getting an order thru Alibaba right now.

if the resistance that made all that heat were eliminated the test could be more accurate.
btw i rebuilt some versapak sticks with the 30t and they have a slight edge torque wise over the 25r.

Yeah, Samsung INR21700-48G, supporting maximum discharging current at 9.6A, maximum pulse discharge current at 35A for 10 Seconds, 25A for 30 Seconds, and 18A for 60 Seconds. The nominal voltage is 3.6V, charging voltage is 4.2V. We are working on a new e-bike battery pack with just this Li-ion 21700, will come back here once there is any update. :slight_smile:

From the same company ….
Enerdan ….

Interesting. I was wondering what was the point of 21700 cells, when they are heavier and larger than 18650 but with no more capacity. It looks like high discharge is the answer!

I wonder if they have better cold-weather performance, too? For electric cars.

WalkIntoTheLight, there's really no point other than the one thought by their creator/designer at Tesla Motors. Battery pack assembly cost reductions, among other reasons.

It's not the cell format what makes a cell good, but the technology and expertise which goes by it. There is a 18650 cell with this sort of high discharge technology inside or thereabouts.

However, this sort of high discharge cell technology isn't really needed for a vehicle unless you need a racing car or it's battery pack is too small. For a more normal vehicle lower discharge (C rating) cells are fine. As long as your battery pack can comfortably output the average maximum power draw of its associated electric motors and electronics everything is fine.

Cheers ^:)

I was wondering if high-discharge cells perform better in cold conditions, than regular cells. If, for example, a high-discharge cell would suffer from less voltage sag in –20 degree weather, it might be useful in an electric car for winter conditions. Then again, I think they heat the batteries anyway, so maybe it’s not necessary.

For flashlights and especially headlamps this is an important aspect. High-discharge cells are much better in the cold compared to high-capacity ones! See here (in German).

There are also batteries with high capacity, and a high C-rating rate.

Samsung 5300mAh 10 - 15A
Samsung 4000mAh 20 A
Sony Vxx 5000 mAh 20 A
Panasonic / Sanyo 21700 xxxxmAh xxA

There is a future of this magnitude.
The technology of these batteries seems to be superior to the 18650 in many areas.

We will see them in the future ……

Why not use low-temperature batteries like NCR18650F?

No, these batteries are not there. Except for one, at this time they are just rumours.
They may hit the market eventually. But the manufacturers are likely to update both 18650 and 21700 when they come up with improvements.

I believe that the evolution of 18650 will not stop.
That’s what I want to believe at least.

The 21700 batteries mentioned above are based on company announcements and ……. leaks ….
In the future they may decide to change their plans.
They know ……
They do ….
They choose …

Currently, these batteries are not on the market, but in the future we will definitely see them or see something similar.

But the sure thing is that there will be much higher batteries and we will see many changes …

Apparently, Vapcell is wrapping the Samsung 30T:

They seem to be available everywhere now, mostly E-Cig shops:

and even Amazon in Germany.

Enercig has them as well: