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Discharge rate and voltage

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Im after some data on the voltage sag for 40138 lifepo4 cells at 5-10c.
Ive purchased some cells from Lifetech for testing, in the hope I can get 8c continous for short 5 seconds bursts while staying above 3v per cell.

Ill be using them for amplifiers, so 12v+ is a must. Ive seen Jy power lithium packs do 8.4c for 20 seconds continously while maintiming over 3v per cell, Im wondering how acheivable that is.

What results have people got from high performance 40138 cells?