This cell has multiple ratings on the wrap, making it quite confusing as to what its actual ratings are. These include “Discharge Current: 40A”, “DISCHARGE CURRENT: 21A/40A”, and “40A”.
I am assuming that 21A is the continuous current rating but it also has a 40A (pulse?) rating in multiple places on the wrap. This is unacceptable as that 40A rating cannot be used to compare this cell to any other. It is useless.
This Nitecore appears to be the same cell used for the Basen, Brillipower, HohmGrown 4200mAh-4500mAh cells and it performs like the others.
The wrap is not the standard heat shrink plastic. It is self-adhesive and appears to be similar to Mylar. I do not know how durable it is compared to the wraps being used now by other companies.
This cell says “IMR26650” and “High Drain Li-Mn” on the wrap but I do not know if it actually uses the same lithium-manganese chemistry used by batteries from the big manufacturers with the IMR model number prefix.
I am rating this Nitecore at 23A and 4200mAh.
The two cells that were tested were donated by IMRBatteries (www.imrbatteries.com). Thank you!
Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/nitecore-40a-4200mah-26650-bench-test-results-useless-pulse-rating-performs-same-as-others.805473/
All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/
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