Article: "What All EV Owner's Should Hear."

E90alex

Well-Known Member
Joined
Feb 17, 2025
Threads
3
Messages
1,017
Reaction score
1,835
Location
Seattle, WA
Vehicles
ā€˜25 MME GT
Yes, it has been studied and confirmed that shallow discharges are better for the battery. Plug in as often as you can. There is zero point in waiting until it’s low first to fill back up when you have home charging.
 

ChasingCoral

Well-Known Member
First Name
Mark
Joined
Feb 3, 2020
Threads
502
Messages
14,318
Reaction score
28,677
Location
Maryland
Vehicles
2021 GB E4X FE, 2022 F-150 Lightning Lariat ER
Occupation
Retired oceanographer
Country flag
This is old information. This has been discussed in articles from Battery University that show Nickel Manganese Cobalt (NMC) type lithium batteries are happiest around 50%. Most importantly, don't let them sit around empty or full. If you need a full charge for a trip, charge to 100% and then drive. If you need to go close to 0% SOC, then immediately charge back up.

Caveat #1: This is for NMC, not LFP batteries. Search this forum for good articles on battery types and proper treatment.

Caveat #2: Analyses by Recurrent show that IRL battery performance really doesn't care much about how you fast charge or how you treat the battery. The biggest determinant of NMC battery health is the age of the battery.

Dozens (hundreds?) of posts on this topic here.
 


Teslaeata

Well-Known Member
First Name
Mark
Joined
Sep 28, 2022
Threads
9
Messages
3,468
Reaction score
4,205
Location
Nottingham, England, UK
Vehicles
Red June ā€˜21 RWD ER Premium MME
Occupation
Forensic vehicle examiner, motor insurance assessor, expert witness
Country flag
Don’t run it to 0% and the car stops moving.
Funny thing is, I never intend doing this?

Just like I would never have run the ICE fuel tank dry.
 

Jimrpa

Well-Known Member
First Name
Jim
Joined
Sep 10, 2020
Threads
297
Messages
9,546
Reaction score
12,874
Location
Wayne, PA
Vehicles
2021 Infinite Blue Premium Mustang Mach E ER AWD
Occupation
Retied (formerly tried to herd highly technical, independent cats)
Country flag
Is there not a reserve buffer in out batteries so that when we charge to 100%, we’re not REALLY charging to 100%? I’ve never known how the buffer is managed and taken into account.
 

DennisD

Well-Known Member
First Name
Dennis
Joined
Nov 26, 2021
Threads
11
Messages
1,214
Reaction score
1,508
Location
Omaha Nebraska
Vehicles
2022 Mustang Mach E
Occupation
Driving School Instructor
Country flag
Is there not a reserve buffer in out batteries so that when we charge to 100%, we’re not REALLY charging to 100%? I’ve never known how the buffer is managed and taken into account.
Not sure about EV Batteries but cell phone batteries have the technology of optimization so as to not charge to 100% to save on battery length. Now I realize that on the settings you can charge to 80% or whatever you want, it would still be nice to have a program that would dissuade you from entertaining the thought of charging to 100%. (new car purchasers come to mind)

Because it is hard on batteries, there should have been something built into the software and when you want to charge to 100% (for a long trip), there should be a notice of "are you sure you want to charge to 100%".

I would assume that would have been an extremely simple programming solution but no one either cared or thought about it?
 

HuntingPudel

Well-Known Member
First Name
Steve
Joined
Mar 23, 2021
Threads
88
Messages
12,942
Reaction score
17,391
Location
Bay Area, CA
Vehicles
2024 MME GT with Performance Upgrade, 1979 Fire-Am, 1972 K/5 Blazer
Occupation
Engineering
Country flag
Is there not a reserve buffer in out batteries so that when we charge to 100%, we’re not REALLY charging to 100%? I’ve never known how the buffer is managed and taken into account.
The MME has buffers on the top and on the bottom to prevent excursions to either extreme. The buffers are approximately 4% on either end. That means that you still won''t want to drain the battery until the car stops moving or charge the battery until it reaches 100%. ??

The fact is that NMC batteries (and to a much lesser extent LFP) do not like to dwell near either extreme. So you can drive the car down under 10% if you are going to immediately charge it above 20% or charge it to above 90% if you are going to immediately drive it back under 80% actual capacity (10% actual = apx. 15% indicated and 80% actual = apx. 85% indicated due to the buffers). Just don't let an NMC battery spend time under or over the "magic" 20%-80% range. ??
 

HuntingPudel

Well-Known Member
First Name
Steve
Joined
Mar 23, 2021
Threads
88
Messages
12,942
Reaction score
17,391
Location
Bay Area, CA
Vehicles
2024 MME GT with Performance Upgrade, 1979 Fire-Am, 1972 K/5 Blazer
Occupation
Engineering
Country flag
Not sure about EV Batteries but cell phone batteries have the technology of optimization so as to not charge to 100% to save on battery length. Now I realize that on the settings you can charge to 80% or whatever you want, it would still be nice to have a program that would dissuade you from entertaining the thought of charging to 100%. (new car purchasers come to mind)

Because it is hard on batteries, there should have been something built into the software and when you want to charge to 100% (for a long trip), there should be a notice of "are you sure you want to charge to 100%".

I would assume that would have been an extremely simple programming solution but no one either cared or thought about it?
This is only true of fairly recent cell iPhones and iPads. For example, my older iPhone 13 Pro cannot do this, while my 16 Pro can. My older iPad Pro also cannot be set to charge to 80%. Not sure about Android devices. Also not sure why Apple excluded older devices from being able to set the maxiumum SoC. ?ā€ā™‚?

Our MMEs (and F150 Lightnings) already have this setting and it can be overridden. The setting is currently location-driven, and the maximum SoC is configurable. In the owner's manual, Ford recommends a 90% (indicated) ceiling. I set mine to 85% (indicated) because that is closest to 80% actual SoC. You can override the setting in the FordPass app (unfortunately, in the currrent version of the app you must wait until the car has reached its SoC ceiling - past versions of the app would allow overriding prior to reaching the limit). ??
 

rhfritz

Well-Known Member
First Name
Rob
Joined
Nov 20, 2022
Threads
8
Messages
180
Reaction score
124
Location
MD
Vehicles
2021 MachE
Country flag
For our daily commute needs, we charge only to 70%. If we're going on a trip, then we charge to 100. While on the trip, we use the GOM to make sure we arrive at a charger before we reach 35% so if the charger is broken, we can get to another one before we get below 20%. On the road, just due to time involved, then we only charge back up to 80.
 

curtisfinney

Well-Known Member
First Name
Curtis
Joined
Dec 16, 2022
Threads
4
Messages
229
Reaction score
188
Location
Minneapolis, MN
Vehicles
Volvo V60, Subaru Forestor, 2023 Mustang Mach E
Occupation
Chemical Engineer
Country flag
OP
OP
Guss

Guss

Well-Known Member
First Name
Larry
Joined
Mar 2, 2025
Threads
8
Messages
68
Reaction score
74
Location
Seattle wa
Vehicles
2024 Mach e
Occupation
Retired
I don’t want to install the NewsBreak app. Please share a summary next time
Ok I will. Didn't know there had to be an app for this.
Sponsored

 
 







Top