Bottom Line: This rewrapped cell has an exaggerated current rating and is the same as the older rewrapped yellow/silver “35A 3000mAh” MXJO. When discharged continuously at its claimed 35A rating an internal protection device is triggered at around 100°C, permanently disabling the cell. This helps protect it from venting but renders the cell useless and means it cannot be rated a 35A cell.
WARNING: Do not assume that this internal protection device will prevent the cell from venting if you abuse this battery! It is not guaranteed to work and is only there as another possible layer of protection against using this cell at way above its rating.
This new yellow/silver wrap has “Type 2” above “20A CDC” in small print on the “back” of the cell. I assume that means Continuous Discharge Current. While I applaud MXJO for putting this rating on the wrap, it’s almost hidden and is essentially useless as very few people know what “CDC” means. In bold print on the front they have a meaningless 35A max or pulse rating with no mention of the continuous rating, which would be easy to add there. Even if they kept the continuous rating on the back of the cell they could have said “20A Continuous” or even “20A Cont.” and used much larger lettering.
These MXJO’s are identical in appearance and performance to the 15A/3000mAh Samsung 30Q. The 18650 ratings table has been updated to include this cell.
I’ve seen posts claiming that this MXJO was lasting twice as long as an HG2 or 30Q before needing to be charged. It cannot last longer than the cell that it is a rewrap of, the Samsung 30Q. If MXJO switches to a lower grade cell, always a risk with rewrapped batteries, it could last less.
The two cells tested were donated by Kai Chen from All Day Vapes (www.alldayvapes365.com). Thank you!
Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/mxjo-yellow-silver-35a-3000mah-18650-bench-retest-results-still-an-overrated-battery.779365/
All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/
18650 current ratings and safety grades: https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447
Store
