Blog - LiFePO4

FAQ: Questions to high speed discharge for LiFePO4 cells

30.Jun 2012

FAQ: Questions to high speed discharge for LiFePO4 cells

Question: What is the maximum impulse current for 1 second and 2 seconds for 40Ah, 100Ah and 180Ah LiFePo4 batteries?

For the 12V models (made of 4 cells), the discharge current is 10C (and even more)
For the single cells, the discharge is up to 20C (or even up to 30C)

Question: Do you have discharge’s curves for such discharge times?

Please see examples for high current discharge curves for 90Ah and 100Ah cells.

Question: What is the internal resistance?

Please see here the information about the Winston Cells.

Question: What is the life cycle number using the batteries in the high current conditions, for 1 and 2 seconds of discharge?

When discharging with 10C currents, the lifetime is about 1000 cycles.
For discharging with 20C currents, the cycle lifetime is about 500 to 800 cycles.

Question: Which is the advisable period between 10C discharges of 1 second, and the advisable period between discharges of 2 seconds and of 30 seconds?

1 second impulse of 10C current: max 10 times in 1 minute (e.g. discharge for 1 second - wait for 5 seconds)
2 second impulse of 10C current: max 5 times in 1 minute (discharge for 2 seconds - wait for 10 seconds)
30 seconds discharge - wait for 2 minutes

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