Real capacity is around 3400 mah, but after calibrating FCC is lower than before. I have some of this batteries with low cycles and health all of them is around 30% when it shoud be higher.
Attach the calibration log.
@torture when discharging it drops from 88% SOC to 8% suddenly
when discharging it drops from 88% SOC to 8% suddenly
Yes this happens for 2 reasons.
1. The cells have a very high internal resistance. If you check these 2 screenshots you will see that the cells voltage gets dropped from 4.2v to 3.5v just for about (3 minutes 39 seconds) with a load of 1500ma. This is not normal they must be replaced.
2. Chip is programmed from factory to consider the cells depleted at around 3.5 - 3.4v since the voltage drop further is considered unstable. But from my practice this is not entirely true and is a very common issue with DELL batteries as the internal resistance increases. A good working solution that i have done many times and never had any customer complaints is to lower the EMF/EDV values so cells would be considered depleted at around 3.1-3.0v
TI has special tool to calculate EDV Constants known like GPC Gauging Calculator.
https://www.ti.com/tool/GPCCEDV
https://www.ti.com/lit/pdf/SLUUB45B
I have lowered EMF to 3400, and set FCC to real capacity read by previous calibration (3400mah) and performed a calibration cycle. Now after calibration FCC is 3000 mah
@torture in case of chip BQ30423 TI V0.08 there is only EMF value or are there also EDV values to modify?
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