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Tim Black said:What is the best way to scale this part for a 4P, 9AH pack?
Hi Tim, sorry for the delay in getting back to your question!
Divide the Design Capacity and Design Energy parameters by 10 (so a 9 Ah pack would be programmed into the bq27621-G1 as 900 mAh, and the same process would be applied to Design Energy). Just remember that you will need to multiply the capacity, power, and current readings from the bq27621-G1 by 10 to get the correct numbers (State of Charge is not affected as it's merely a ratio of the Remaining and Full Charge Capacity measurements).