The KeepPower IMR 2500mAh with white labels ( old ) , has within the LG HE2.
The new KeepPower IMR 2500mAh black, has within the Samsung 25R.
The old is really very powerful battery .
In relation to the Efest 2500 purple, is stronger .
But if she is the black then it is weaker up to 3.8 V.
From there down, it’s better the performance.
Sorry, but I think Samsung 25R (Green), is much better.
I bought 20 such batteries (not all for me of course) from NKON and is flawless.
I am steamer Electronic Cigarettes and discharge into machine mod, is the most often from 3 Amps and can even reach 90 Amps (0.1 Oms in 3 Volts.)
Naturally me personally, do not care to 90 Amps, but for discharge of 5 - 7 Amps. , My 25R Samsung have shown to be the best.
Even the Sony VTC5.
The HE2 / 4 is the strongest of the 4.2 V up to 3.8V. After the 3.7 Volts, is the marked their weakness, more than the other two (VTC5-25R)
Measured Volts from fresh battery to 4.2V, all have almost the same performance, but from the 3.8V and then the 25R is purely the strongest battery of the three, up to 3.3V, which will go for charging.
For me it is all three (four with HE4) batteries are very good, but I personally have seen the best performance in electronic cigarette with the 25R, the Ohm these.
After the 10 Amps yes, Sony is better, but personally 10 AMPS in electronic cigarette, avoid them.
I was surprised, however, the very low yield of the test, especially since I have these batteries and I see that the same performance with the blue.
Henrik, a big thank you for your trouble, my friend.
If it was you, little would know.
Always be well man.