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    Samsung 25R/LG 18650HE2/ Sony VTC5 high power 18650 battery

    Room temp 20-25*C. Usually Internal resistance not changed in range 5% - 80% of discharged capacity. I'm interested from Internal resistance with minimal influence of temperature. For that I look beginning of discharging charts. 30Q have bigger capacity and is wrong to compare in same capacity...
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    Samsung 25R/LG 18650HE2/ Sony VTC5 high power 18650 battery

    I have 25R and 18650GA for rest cell I used summary info from many sources. Chart is my approximation and is not 100% true... for now. In the beginning of discharging charts (near 3.8-3.7 V) temp is still low and difference in voltage is bigger.
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    Samsung 25R/LG 18650HE2/ Sony VTC5 high power 18650 battery

    In cold conditions internal resistance of 30Q is higher from 25R. When I get 30Q will be able to tell this with certitude. Charts: https://www.dropbox.com/s/x6514tdp5vrvbd5/samsung%2025r5%2020a%202500mah%2018650%20constant-current%20tests.bmp?dl=0...
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    Samsung 25R/LG 18650HE2/ Sony VTC5 high power 18650 battery

    Sorry for bad English. I not create this video, only watched. My measurement method is better. On grafhic Aspire ICR "40A" 1800mAh cell is between VTC4 and HB6. My chart is idealistic presentation of technological limits in Li-based battery.
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    Samsung 25R/LG 18650HE2/ Sony VTC5 high power 18650 battery

    Many thanks CamLight for battery test work and sharing data. Yes, temperature is the key for the hidden questions. Recently I made a few tests on panasonic/sanyo 18650GA and ration between DC internal resistance, current and temp (Kelvin losses). First I put battery in termally isolated...
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