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BQ34Z100-G1: BQ34Z100-G1 - SOC unexpected

Part Number: BQ34Z100-G1

Hello,

We are using the BQ34Z100-G1 to read the battery SOC.  The goal is to monitor the battery.  If the SOC gets too low we do a clean shut down of the system.

We use 3 YUSA NP18-12b batteries in series. (18 Ah)

We configured the fuel gauge chip chemistry to YUSA NP7-12FR (14 Ah)

We run and the SOC steadily decreases.  For testing we start with an SOC of 100%.  After running for about 35 minutes the SOC reads 60%, the current goes from 9 mA to 11mA and the voltage drops correspondingly.  The SOC then suddenly reads 0%.

I was expecting something different.

Is this the correct chemistry to select for our choice of battery?

Is this the expected behavior?

Thanks !