Latest release Vapcell 21700 5600mah 12.5A battery

Ordered 2 pieces of 10440 batteries from the aliexpress store. Will check them out :slight_smile:

Thanks again for getting us a new type nice battery Dennis.

Got my 16340 cells from Illumn.

Capacity test using 500 mA discharge current on Lii-500:
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IR, measured using a DMM and resistors:
Cell 1: 0.21 Ohm
Cell 2: 0.20 Ohm

10440 shouldn’t have a button top option? I will see if it will reach the positive contact in my DQG Tiny.

we have button top , we will add it in web,sorry

Thanks for the test, a bit low cap

we test it more than 750mah

Is it possible to add this button top to my current order? It is awaiting shipment at this moment.

yeah, contact Ali Customer service staff to change it

No problem. It may just be the nature of this charger/analyzer (Lii-500). It consistently indicates lower capacity figures on all cells I test with it by about 5-6%.

If I am correct, Vapcell measures capacity with 0.2C, which gives 150mA instead of 500. Maybe, this is the reason of the difference?

The chart they posted (see below) shows them measuring capacity using various current levels, starting with as low as 0.5A and going up to 8A. At 0.5A, their tested capacity is 812mAh. The main difference is their cutoff voltage is 2.5V. Mine is 2.8V, but there can’t be much capacity left there at that point.

I have kept 3V in my charger (default value), but according to the graph that also wouldn’t make much difference.

BTW, I just repeated what they wrote on the Ali site:
Typical Capacity 800mAh (0.2C discharge)

Notice that the “begin volt” is 4.198V. This is almost impossible to achieve even with cells fresh out of the charger, I assume they must have set the termination beyond 4.2V in order to start the test at such high voltage. Probably around 4.25-4.3V.

With the MC3000 you get an option of “d reduce” which is the equivalent of a reversed CV phase for discharging, maybe with a termination current low enough along with the high starting voltage the 800mAh+ capacity can be achieved.

Well, testing chargers discharge down to 2,8V.

If you want full capacity, you need to go down to 2,5V.

Yeah, but I find it hard to believe that 5-6% of the cell’s capacity remains between 2.8 and 2.5V.

When people say down to 2.5/2.8V do they mean under load or not? No one seems to make the distinction but i’m pretty sure it makes a not insignificant difference depending on the rate.

Under load, I believe.

Finally received the two 16340 cells.
Charged then discharged at 1A to give 810mAh and 827mAh.
4.16 resting voltage after one hour.

Performance comparisons:

Vapcell 16340 800mAh vs AWT 16340 550mAh cell.

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Vapcell 14500 1000mAh vs Windyfire 14500 650mAh cell.

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Vapcell 14500 1000mAh vs Windyfire 14500 650mAh cell.

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Vapcell 16340 800mAh vs AWT 16340 550mAh cell.

Nice testing and graphs :+1: :+1: :+1: , with clear winners.

U took the words from my fingers :wink:
Thanks for the test CRX!
Mine should be arriving next week, and I’m looking forward to use them :wink: Thanks to Vapcell :partying_face:

Cool :THUMBS-UP:
These tests give a better real life usage perspective on performance rather than just testing the cells in a discharge rig.
The results differ in every run due to temperature etc except the lower level regulated runs.
I must admit seeing it like this makes me start leaning towards regulated drivers more as opposed to just FET driven.
Different cell but here's the FW3A started on Max for comparison too.