Actual useable battery capacity

[Shutts]

I have a 2021 Mach E 98kwh extended range RWD. Love it. However, having trouble understanding mileage range. Driven very carefully and averaging 4.1 miles per kWh. So why is full battery showing 319miles? Even if fully drained and recharged at 4.1 then mathematical full range would be 4.1 * 98 = 401.8miles which we know is not correct! My assumption is that of the 98kwh not all is “available“ for driving and there is a buffer for safety built in.

is this correct or am I missing something very simple?

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[Howard]

Usable kwh is 91 on an extended range battery for MME. How many miles can you actually travel on 100% charge (difference between initial odometer reading and final odometer reading) down to say 15-20%? You also need to know what your HVB state of health is. I noticed you are in the UK so I'm not sure if EU MME's received the update changing usable kwh from 88 (initial usable capacity in 2021) to 91 kwh. Doing some simple math, if your MME battery is still at 88 kwh usable capacity and your HVB state of health is around 90%, then GOM at 319 miles is pretty close. Only way I know to look at HVB SOH is via OBDII reader and an app like CarScanner. Hope this was helpful. I have a 2023 RWD ER MME; 100% charge range is typically around 320 miles (as shown on GOM). I average around 3.5 to 3.7 mi/kwh; my HVB SOH is 99.5% (I have 14,500 miles on the vehicle).

 

[RickMachE]

Reset your EV driving history, and you should see close to the correct math for a 91kWh battery. Posted near daily.

Edit - or if the capacity hasn't been updated, 88kWh.

 

[Shutts]

Usable kwh is 91 on an extended range battery for MME. How many miles can you actually travel on 100% charge (difference between initial odometer reading and final odometer reading) down to say 15-20%? You also need to know what your HVB state of health is. I noticed you are in the UK so I'm not sure if EU MME's received the update changing usable kwh from 88 (initial usable capacity in 2021) to 91 kwh. Doing some simple math, if your MME battery is still at 88 kwh usable capacity and your HVB state of health is around 90%, then GOM at 319 miles is pretty close. Only way I know to look at HVB SOH is via OBDII reader and an app like CarScanner. Hope this was helpful. I have a 2023 RWD ER MME; 100% charge range is typically around 320 miles (as shown on GOM). I average around 3.5 to 3.7 mi/kwh; my HVB SOH is 99.5% (I have 14,500 miles on the vehicle).

Thanks- very useful indeed

 

[portlandg]

I have a 2021 Mach E 98kwh extended range RWD. Love it. However, having trouble understanding mileage range. Driven very carefully and averaging 4.1 miles per kWh. So why is full battery showing 319miles? Even if fully drained and recharged at 4.1 then mathematical full range would be 4.1 * 98 = 401.8miles which we know is not correct! My assumption is that of the 98kwh not all is “available“ for driving and there is a buffer for safety built in.

is this correct or am I missing something very simple?

Our MME's (MY21) didn't get the OTA update increasing usable charge to 91 KW/h. We are still on 88KW/h. So simple maths is 4.1 x 88 = 360. For your GOM to read this you will also need to reset your driving history.

 

[Shutts]

Our MME's (MY21) didn't get the OTA update increasing usable charge to 91 KW/h. We are still on 88KW/h. So simple maths is 4.1 x 88 = 360. For your GOM to read this you will also need to reset your driving history.

Thanks- are you the same as me and getting slightly racked off that in the UK we seem to be missing out on software capabilities? ….Usable charge increase you mention/ non connectivity to Tronity/ non connectivity to Apple for the EV charging / phone as key etc etc…. We seem to be suffering from lack of focus- our apps have been downgraded with nothing new added to them.
The actual car is excellent- I just feel Ford as letting down it’s users , particularly those in the UK, with lack of software capabilities.

 

[HuntingPudel]

I am in the US and my car still seems to have 88KWh as its battery capacity. 3 extra KWh won’t buy me much, so I don’t really care. It would be nice but I don’t need it since my car gets sub-3 miles/KWh. ?‍?

 

[dtbaker61]

I am in the US and my car still seems to have 88KWh as its battery capacity. 3 extra KWh won’t buy me much, so I don’t really care. It would be nice but I don’t need it since my car gets sub-3 miles/KWh. ?‍?

it would be 'unwise' to consider the last 3 kWhr as 'usable'.... for best battery life it is advisable to keep your battery between 20%-80%. Charge more frequently and avoiding the top and bottom when possible. Full charge to 100% before a trip is fine, but discharge below 5% is potentially damaging over time.

 

[ChasingCoral]

I have a 2021 Mach E 98kwh extended range RWD. Love it. However, having trouble understanding mileage range. Driven very carefully and averaging 4.1 miles per kWh. So why is full battery showing 319miles? Even if fully drained and recharged at 4.1 then mathematical full range would be 4.1 * 98 = 401.8miles which we know is not correct! My assumption is that of the 98kwh not all is “available“ for driving and there is a buffer for safety built in.

is this correct or am I missing something very simple?

1. See correction above regarding 88kWh battery capacity.
2. Yes, if you drive very carefully you can average 4.1 mpk. However, Ford doesn't want you to get stuck somewhere on a day you decide to drive like a bat out of hell but assumed you would still get your usual efficiency. The Guess-o-Meter doesn't know where you are going on your next trip, what the weather conditions will be, how you are going to drive, or what speed you will drive. Therefore the GOM is conservative.
3. Read this: https://www.macheforum.com/site/thr...ulate-how-far-your-mach-e-can-really-go.6104/

 

[HuntingPudel]

it would be 'unwise' to consider the last 3 kWhr as 'usable'.... for best battery life it is advisable to keep your battery between 20%-80%. Charge more frequently and avoiding the top and bottom when possible. Full charge to 100% before a trip is fine, but discharge below 5% is potentially damaging over time.

Yes, I already know this. The extra 3KWh will only buy me about 1.9KWh when all is said and done since I keep my SoC between 85% and 20% (indicated - upper and lower buffers keep that top end below 81% and the lower end above 24% when considering actual capacity). Pretty useless when averaging under 3 mi/KWh. ?‍?

 

[dtbaker61]

Yes, I already know this. The extra 3KWh will only buy me about 1.9KWh when all is said and done since I keep my SoC between 85% and 20% (indicated - upper and lower buffers keep that top end below 81% and the lower end above 24% when considering actual capacity). Pretty useless when averaging under 3 mi/KWh. ?‍?

I know you know this @HuntingPudel , my reply was more the benefit of the OP @Shutts who appears 'racked off' missing out on the software 'adjustment' making 3 additional kWhr available. i.e. this doesn't change the actual battery capacity, and is more of a marketing thing to hit a number in stated battery capacity than actually beneficial since you never want to get that close to using max range anyway.

 

[superdave80]

So why is full battery showing 319miles?

In my experience, there is a maximum limit that the Mach-E will show for miles left,no matter how efficiently you drive. Despite the fact that my driving gets me about 320 or more on a full charge, I never see the miles left reach above about 280.

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