Ah, yeah a 15A load is pretty small. You won't see much benefit from paralleling them at that kind of current draw. In fact I'm incredibly confident you won't have any thermal issues at all at that kind of load.
From my earlier testing:
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At 1C dis/charge I saw a pretty constant 4F above ambient in cell temperature. The cell heated up very uniformly. The terminals I thought would heat up as well, but they always remained at a lower temperature than the cell. This may be due to the large aluminum blocks on them.
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I agree that using the voltage is not a possiblity for a SOC meter. That is why I am using a ammeter and counting the amphours in/out of the pack for my BMS' SOC meter.