Severe loss of range

[HuntingPudel]

I saw that. Didn't impress me. I'll just follow the manual.

Do whatever. There are a lot of other sources on the internet that say pretty much the same thing. I did some work for one of Tesla's lead battery engineers a few years back and got to nerd out with him over all sorts of stuff. He said very similar.

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[evfinder]

My understanding is that any string of batteries, over time, can get cells out of balance when being discharged/charged and this results in a drop in range. The solution, known as a levelling charge, is usually a slight overcharge using a low amperage (about 2 amps) charge to coax low cells up to full charge. To trigger a levelling charge the batteries need to be charged to 100% periodically. I usually do this when I know that I am going to be driving a longer distance than usual as LMC batteries do not like to be stored at 100% charge for long periods.

 

[Mach-Lee]

My understanding is that any string of batteries, over time, can get cells out of balance when being discharged/charged and this results in a drop in range. The solution, known as a levelling charge, is usually a slight overcharge using a low amperage (about 2 amps) charge to coax low cells up to full charge. To trigger a levelling charge the batteries need to be charged to 100% periodically. I usually do this when I know that I am going to be driving a longer distance than usual as LMC batteries do not like to be stored at 100% charge for long periods.

The BECM on the Mach-E performs continuous balancing while the car is parked, regardless of the state of charge. The cell voltages will basically all be identical after the car has been parked for 24 hours. Charging to 100% and letting it sit would do a top balance. But the main point of charging to 100% is to reset the coulomb counter for state of charge and cell capacity determination.

 

[ex2bot]

Please remind me how to charge to 100%. My MME is set to charge to 90%. I plug into a ChargePoint Level 2 charger at home every night which is programmed to allow charging betweeen midnight and 6am when my electric rates are lowest. Yesterday I plugged the car into the charger, then while I was inside with the car on, I changed the settings on the screen to charge to 100%. But when I got up this morning it had only charged to 90% as usual. What am I doing wrong? Does there need to be actual charging taking place to override the 90% “standard” settings? Do I need to turn the ChargePoint charger on before trying to set the car to 100%?

Just to be explicit here, in the charging tab in the app under Target Charge Locations, set it to 100% and tap the SAVE button. Wait for it to save, then verify it took.

 

[ex2bot]

I think I I’ve got it. The battery never had the capacity the GOM stated. It just took some time to adjust the reading. I have never noticed this in our MME with a lithium battery so this is a quirk with LPF batteries only? Thanks for the explanation. I bought the car to learn about the new technology and I continue to do so after 3 years!

Voltage of a battery pack generally increases as the state of charge (SOC) increases. With a Lithium Iron Phosphate (LFP) battery, the voltage curve over most of the usable range is flat, so the actual state of charge isn’t easy to calculate from voltage alone. The voltage rises more noticeably when approaching 100% SOC and drops more noticeably when approaching 0%.

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