Does charging to 100% use the full 140+ kWh battery?

[hajalie24]

I noticed a few things whenever I charge to 100%.

1) It takes a lot longer to from 99% to 100% than any other percentage.

2.) While driving, it stays at 100% for much more miles. We drove 14 miles before the truck went to 99% battery. See photos

Just going by the 2 miles per kWh efficiency number and how many miles it takes before it reaches 99%, it seems to corroborate my theory.

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[TaxmanHog]

This is well documented in older posts, everything is normal.

The BMS is doing balancing routines the last percentage point, also it's doesn't always immediately trip to 100%, I've pulled the plug at 99% and started the truck and watched the SOC value jump to 100% immediately.

In theory they protected the headroom buffer for battery health, so not likely that 143 KWH GROSS capacity is charged.

 

[Grease Lightning]

This happens as it is balancing the cells. I have noticed mine occasionally taking longer to balance and then stays longer at 100% on a drive after a long period of not balancing or noticing a larger deviation occurring.

As the BMS is anticipating a certain voltage range around 131 kWh to show full, it seems the software gauge is limited to 100% even if the voltage exceeds that range because of the balancing process.

Currently the BMS software seems glitchy on some as it might show a decent difference between SOCd and actual kWh in the tank.

For me that started on one of the last OTA updates. Still hoping @Ford Motor Company has an update in the queue to fix it.

 

[hajalie24]

This is well documented in older posts, everything is normal.

The BMS is doing balancing routines the last percentage point, also it's doesn't always immediately trip to 100%, I've pulled the plug at 99% and started the truck and watched the SOC value jump to 100% immediately.

In theory they protected the headroom buffer for battery health, so not likely that 143 KWH GROSS capacity is charged.

Thanks for the answers all. I've also noticed the SOC go from 99% to 100% after I disconnected from a fast charge.

 

[Firn]

I monitored a charging session through the OBD port. Although going from 99% to 100% did take a lot longer, the individual cell voltage did not increase much, not enough to provide extra capacity.

 

[Adventureboy]

I monitored a charging session through the OBD port. Although going from 99% to 100% did take a lot longer, the individual cell voltage did not increase much, not enough to provide extra capacity.

This is true. The final stage of balancing is only putting very small amounts into individual cells to balance them with the others. You would have to monitor all of the cells to see this happening. It takes a long time since it is only very small voltage differentials (like a few 100s of a volt). This won't have a noticeable impact on capacity.

 

[Firn]

This is true. The final stage of balancing is only putting very small amounts into individual cells to balance them with the others. You would have to monitor all of the cells to see this happening. It takes a long time since it is only very small voltage differentials (like a few 100s of a volt). This won't have a noticeable impact on capacity.

Yep. One of the parameters reported is cell variation and the overall change (reduction) in voltage variation was very small. Surprisingly the balancing only reduce the variation by about half.

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