Are those OK internal resistance numbers for that size cell?
Yes - very good. 150 is a good 'par' / ballpark DCIR number to see for a new, quality 16340 of this type, as measured by an MC3000. That's the number that makes me smile when I'm testing cells like these. Note that these shoot a pretty tight group as well, which is always a favorable indication with a batch of new cells.
I specified the MC3000, because I'm still re-calibrating my brain a bit, having switched from Opus 3100 to MC3000 less than a year ago, after having used the former for >5. If I measured these with an Opus (which I didn't), they'd likely read closer to 250 than 150. Just for a data point, I tested the NL166 (which has now been replaced by the NL169 and was rated @650mAh [but @4A]]) last year using both testers (also @1A discharge to 2.8V):
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The resulting capacity / internal resistance indicated by the MC3000 was:
Cell #6 - 671 mAh - 0.153 Ω
Cell #7 - 677 mAh - 0.163 Ω
Cell #8 - 677 mAh - 0.137 Ω
Cell #9 - 666 mAh - 0.153 Ω
I then ran the same test on the Opus, with the following results:
Cell #6 - 718 mAh - 0.257 Ω
Cell #7 - 709 mAh - 0.249 Ω
Cell #8 - 741 mAh - 0.226 Ω
Cell #9 - 725 mAh - 0.248 Ω
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You'll note that the IR numbers for the NL166 were essentially the same as the NL169 numbers in previous post, and also that the Opus measured the same cells ~100 milliOhms higher than the MC3000 did. Interestingly, when HKJ tested the NL166, he listed "0.22". He typically reported 0.22-0.25 IRs for most of the 16340 (of this type) tests of his that I've referenced. He of course uses a very different test setup (and it's likely a 'proper' one, I would add). You'll probably also note that the Opus reported significantly higher capacity numbers, and also that the MC3000 capacity numbers slightly exceeded the cells' rating.
OK, that's too many numbers for a sparky guy; and no, I'm not some 'battery afficionado' type by any means - I just use a lot of 16340s, so I see a lot of those numbers.