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

WOW this 30T is one serious battery, thank you for testing and um…

Sacrificing!! :open_mouth:

Nice cell. That’s an interesting battery holder. Did you buy it or make it? Any links if you bought it please?

Samsung 30T’s motto: “HKJ’s equipment can’t handle my power.”
How’s that for advertising?

Probably the best e-bike cell it seems. Unless you have an underpowered EU-compliant motor.

Incredible! I want one!! Or 20! Excellent job once again HKJ!!

Samsung introduced their 21700 e-bike battery in 2016: 4750mAh and 9A max discharge.

Wow, 4750 and 9A. That does seem like an ideal e-bike cell - lots of capacity and just enough current. What size / form factor?

It is from fastech: https://www.fasttech.com/products/1425/10024652/5339401

Cylindrical, 21mm diameter and 70.0mm hight. In case that was the question.

Where in the world can I order these cells? I’ve been using the Sanyo 20700B, but I really want to get my hands on those. Any info or links would be greatly appreciated.

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

Cheers!

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).