This cell has only one rating on the wrap, “40A”. Simply put, that is ridiculous.
That, and other things, has forced me to issue my first ever DO NOT BUY recommendation. The biggest problem is that this appears to be a rewrap of the Sanyo 15A-16A 4000mAh NCR20700B cell that AWT decided to grossly exaggerate the current rating for. The capacity rating is exaggerated too. This cell is identical in appearance and essentially identical in performance to the Sanyo NCR20700B.
Aweite (AWT) doesn’t appear to have a web site but this cell is on their Alibaba pages. Earlier I found a page that referred to the Sanyo NCR20700B in the description for this cell and issued a warning (https://www.facebook.com/batterymooch/posts/1899722450317332).
The various Alibaba pages for this cell (https://imgur.com/a/voBPg) have ratings from 25A to 40A using the terms “max cont. discharge rate”, “fast discharging current”, “max discharging current”, or no description of what the “40A” number means at all. I guess you get to pick the rating that fits your mood! But at only 25A continuous this cell got hot enough to boil water, 101°C.
One Alibaba page claims the following…
– A tested capacity of 4150mA at 35A. That’s false. The cell only reached about 2500mAh, its temperature rose to 116°C, and it failed. Probably due to one of Sanyo’s internal protection devices being activated due to the dangerously high temperature.
– A battery temperature of 37°C for a 10A discharge. That’s false. The temperature rises to about 60°C at 10A (down to its rated 2.5V cutoff).
– A rating of 15C. That’s false and is lousy math too. Their claimed 4200mAh capacity and 25A/40A ratings would mean it’s a 6C/9.5C cell…if those current and capacity ratings were accurate. They’re not though. This is a 4C cell.
Another Alibaba page gave it a rating of 0.2C to 2C, which is just beyond silly and obviously an error they didn’t feel the need to correct.
I am giving this AWT a rating of 15A and 4000mAh.
I am also giving this AWT cell a DO NOT BUY recommendation due to the outrageous overrating and false performance data on Alibaba. If you need an ultra-high capacity 20700 cell for low to moderate power vaping at up to 10A/37W per cell then get the Sanyo NCR20700B.
The two cells that were tested were purchased by me from ebay’s r-lsales.
Some of AWT’s Alibaba pages for this battery: https://imgur.com/a/voBPg
Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/bench-test-results-awt-40a-4200mah-20700…preposterously-overrated-false-performance-data-do-not-b.812261/
All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entrty/list-of-battery-tests.7436/
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