Not bad. Not bad at all…
What are you looking at?
Im sure if you’ve been vaping long enough or have an active interest in battery performance you’ve likely seen these graphs before. The Vapcell (Sony VTC6A re-wrap) claims to be a 25A, 3000mAh cell. As we are the only people we know of in the UK with these (confirmed by Vapcell as the only buyer right now) we wanted to carry out a little more than the usual due diligence before placing them on the market. The initial blog post is here.
How did it do?
The initial 10A discharge maintained a strong 2500mAh. Not quite enough for me to call it a true 3000mAh cell, but Sony rate their cells on discharges at half of this, and its still 200mAh above what is widely recognised for the VTC5A at this load.
At 15A we start to see cell temperature rise to 37’c. This is still unbelievably low. So low that i started questioning the ordinarily well respected test equipment we have (more on that later).
At 20A temperature rose to 48.8’C and the cell maintained 2400mAh. This is still a very low temperature for a 20A continuous discharge.
At 25A temperature rose to 61.8’C, and managed 2200mAh. This is still strong going given we’re now at the rating given by Vapcell.
At 30A, temperature seconds before the end of test was 74.5’C. This is pretty hot, but still under the 80’C maximum working temperature limit Sony set for all of their cells. It also still managed to provide 2000mAh. Vapcell may have been a little conservative with their rating, which is always far better than being wildly (and dangerously) optimistic.
A further run at 35A (not shown) just for the sake of science gave a reading of 86.8’C. This is over Sony’s recommendations, and over that which would be safe in individual cell use outside of a battery pack that doesn’t have an integrated cooling system.
The thing that sticks out for me against the VTC5A and the VTC6 which people are hoping this will be a hybrid of, is the sag. Its considerably more than both of them. I’m investigating if some of this is in our equipment although previous tests against others peoples results have been near identical. I hope to do a shootout between all 3 soon.
We use a West Mountain Radio Computer Battery Analyser IV Pro. Its a small but very capable unit, and until recently was being used by a very well known cell tester and still in use with other cell vendors. Cost vs performance is fantastic and not out of the scope of companies selling a reasonably large number of cells to help with cell testing/verification. We dont normally release this stuff but as this is a brand new cell with barely any available information, it felt like the right thing to do.
In the interest of transparency, i got a reading of just 15’C @ 10A and 24’C @ 15A on the initial tests. This was obviously far too low to be correct, it was traced to a faulty temperature sensor on the unit. Its a little magnetic sensor that sends a temperature signature to the software. Speaking to another cell vendor and user of this system this appears to be a common thing, so to rule out the errors and get even more accurate figures i’ve switched to a standalone laser/infra red temperature sensor. All readings above were taken with this new, fully calibrated equipment.
That’s all. If you have any questions or need any further information, drop us a message or send us an email