How accurate is the car Scanner app for SOH battery?

[Ravensfan1996]

How accurate is the car Scanner app for SOH of the battery? Mine is almost 3 years old and shows 91%. Only have 24k miles. (Premium ER AWD) I charge to 90%. Just wondering if this sounds about right. I don’t really notice any change in range though.

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[phidauex]

The app just reports what the car says the SOH is, which is just what the battery BMS calculates it is. It will update over time, and needs periodic 100% charge cycles to help it calculate, so if you are curious you could try charging to 100%, driving for a while, then checking it again.

Generally speaking though SOH is a very hard thing to pin down for such a large group of cells, so any calculation that the BMS does is a pretty rough estimate, because it has to compare the change over time in how voltage changes with discharge, which is looking for a very small change in a very small measurement.

 

[Ravensfan1996]

The app just reports what the car says the SOH is, which is just what the battery BMS calculates it is. It will update over time, and needs periodic 100% charge cycles to help it calculate, so if you are curious you could try charging to 100%, driving for a while, then checking it again.

Generally speaking though SOH is a very hard thing to pin down for such a large group of cells, so any calculation that the BMS does is a pretty rough estimate, because it has to compare the change over time in how voltage changes with discharge, which is looking for a very small change in a very small measurement.

Thanks, i dont charge to 100% often except a few road trips. I’ll try your suggestion.

 

[Mach-Lee]

Thanks, i dont charge to 100% often except a few road trips. I’ll try your suggestion.

https://www.macheforum.com/site/threads/hv-battery-calibration-procedure.23815/

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