I ran several tests over this week, it's not scientific by any means but there were multiple data points to interpret. All cycles were done in a controlled climate environment kept at 65°F.
Results for the impatient
Actual capacity: 2895mAh, 10% variance
Cell stated capacity: 2950mAh
Average IR: 24
For the BlueMAX li-ion cells from the last test, I did another test run to confirm that the charger was working within reason which it was. Note that the first test was using a discharge cutoff voltage of 3.0v, which is too high hence the low reported mAh capacity.
Average capacity: 1472mAh, 2% variance
Cell stated capacity: 1500mAh
Average IR: 33mΩ
This was the stick li-ion that used to be blue. It had fairly low ratings but the capacity statement is accurate. Notice on how one discharge trial run was done at 2A in order to show a fairer comparison as 6.4A discharge was relatively high compared to the larger capacity batteries tested - not like it mattered, as the battery performed worse during that run lol.
Average capacity: 2965mAh, 1% variance
Cell stated capacity: 3000mAh
Average IR: 15mΩ
Larger capacity Titanpower li-ion pack. This one uses Sony cells so I am expecting accurate specs.
Average capacity: 2380mAh, 8% variance
Cell stated capacity: 2380/2400mAh
Average IR: 25mΩ
Smaller capacity Titanpower li-ion pack, the one with the unknown cells.
Average capacity: 2584mAh, 4% variance
Average IR: 6mΩ
Kypom lipo pack. Strangely enough both the li-ion battery and lipo battery are both "K6 series" despite differing chemistry, form factor, capacity, C rating...
Turnigy Bolt HV 2400mAh
Actual capacity: 1864mAh (inaccurate as stated above)
Average IR: 5mΩ
Used Turnigy Bolt Li-HV pack. This one should perform great seeing as how it's rated for 65C. I do not have a Li-HV charger at the moment so I will just charge this up to 4.20v/cell as normal lipo and run the discharge test.
This ends my analysis of these batteries. Again, the sample size is not scientific but this gives you a good idea on what to expect. The unmasking of the actual cells in the previous post is helpful for determining actual quality (specifications aside). Speaking of which...
Wow...KAN is still in business. Back in the early 2000's the KAN 1050 was the only NIMN 2/3A cell that could step out of the NICD world for Airsoft of the 600AE 2/3A.
Ill bet your red cell is this one:
18650 Battery Rechargeable Lithium Ion Ur18650Zy 3.7V 2600Mah 5A For Medical Equipment Made In Japan / Bank / E Book From Ecodream, $3.02 | DHgate.Com
This cell has information printed on its circumference so it might be just a different batch...but I found a better match, especially after looking at the results of my testing.
Sanyo ZL2 18650 2380mAh 10A Battery
Sanyo ZL2 18650 2380mAh 10A cell, the two Data Matrix encoded values printed on the heatshrink is different on both of my cells, and the same is true for the ones in the product photo.
Had to manually recreate these since the contrast was not good enough for my phone to scan. One is 8J11G8M842540014, other is 8J61GC8650540014. No matches on Bing or Google, so these are likely serial or batch numbers.
This likely means that the 2600mAh battery is a whopping 3.8C in order to abide by the manufacturer recommended 10A continuous discharge.
Titanpower 2s 2600mAh: 10A maximum discharge, barely even capable of reliably running an entry level AEG. Don't buy this.
Titanpower 2s 3000mAh: 15A maximum discharge, bare minimum requirement of being able to run a stock AEG. Don't buy this.
Kypom 2s 2700mAh: Actually not bad measurements, just with a slightly overstated capacity. Best battery out of the bunch by far.
Kypom 2s 1500mAh: I am unsure about the cell specifications but higher IR than even the Titanpower 2600mAh so I would assume that this one tops out at under 10A continuous discharge. Double heatshrink is kind of weird. Would not recommend.