Would you happen to have a different 18650 lying around that you could test with?
yep, just doing test runs with a 2 years old sanyo 2600mAh protected
first discharge: 2223mAh @ 3.4A
will take a day to run all tests again on Sanyo
NCR 18650B cut off at 2.5V, if you discharge up to 3.0V still have some capacity left.
This is the datasheet
Can use HKJ’s comparator to get figure if cut off at 2.8V.
Thanks, but already took into account what discharge of protected cell to 3.0V should be, my cell is still getting lower capacity than it should.
You may be able to test the battery directly, bypass the protection, without actually removing the protection. If you can lift up the pcb enough to get to the battery negative. Fasttech has new 18650 clear shrinkwrap.
If you're removing the shrink, you don't need to lift up the protection because the body is negative.
good tip, didn’t think of that. When I finish this round of tests with Sanyo 2600mAh, I’ll try going bypassing protection.
I mean removing only the clear shrink.
yes, I know what you meant 