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.
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.
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.