Bigger may not be better when it comes to the battery.

[SichuanHot]

I wouldn't be worried about charging to 100% battery nominal voltage either, usually ~4.2V. I've used and abused Lipo batteries on my RC planes for ages now and to my surprise a very cheap set of Lipos that I've had for almost 10 years still charges and discharges well and powers my fun little parkflier with no issues.

 

[AZFox]

Even charging to 100% does not mean the cells are truly going to 100%; there's a buffer built in - my Mach E has about 7% buffer built in so even when I charge to 100%, it's less than that in reality.

No doubt there will be a hidden buffer. They'd be crazy not to do that.

The reason I wrote that state-of-charge should be kept between 20% and 80% is because I looked it up and that's what I discovered.

I just looked it up again.

Question​

What kind of battery chemistry does a mustang mach e have?​

Answer​

The Ford Mustang Mach-E can have either a Nickel Cobalt Manganese (NCM) or a Lithium Iron Phosphate (LFP) battery chemistry. The choice of battery depends on the model year and the specific range variant. [...]​

​

Question​

What kind of battery chemistry will a Slate Truck a have?​

Answer​

The Slate Truck will use nickel-manganese-cobalt (NMC) batteries rather than the cheaper lithium-iron-phosphate (LFP) batteries. [...]​

​

Question​

Should an EV with nickel-manganese-cobalt (NMC) batteries be charged to full capacity and/or discharged to near-zero capacity?​

Answer​

For electric vehicles (EVs) equipped with nickel-manganese-cobalt (NMC) batteries, it is generally recommended to avoid charging them to 100% capacity and discharging them to near-zero capacity to maximize battery longevity.​

​

Charging NMC batteries to 100% every now and then is acceptable, but they should not be left at full charge for extended periods.​

​

It is also advised to keep the battery state of charge (SoC) within a moderate range, typically between 20% and 80%, to prevent excessive stress on the battery.​

​

Discharging NMC batteries to very low levels can also be detrimental to their health. Most EVs have built-in battery management systems (BMS) that prevent the battery from being completely discharged, but it is still best to avoid letting the battery drop below 20% if possible.​

​

Regularly charging and discharging NMC batteries within a narrower SoC range, such as between 40% and 80%, is believed to be better for the long-term health of the battery compared to frequently discharging it to very low levels or charging it to 100%.​

​

In summary, for optimal battery life, it is advisable to charge NMC batteries to around 80% and avoid discharging them below 20%, unless necessary for long trips.​

As an EV n00b I can't vouch for the veracity of this. Source is Brave Search. Popup links to web sources are provided in the answers there, but those didn't transfer to here.

 

[bartflossom]

My dream plane if I win the Lotto:

If I win the lottery...

 

[cvollers]

No doubt there will be a hidden buffer. They'd be crazy not to do that.

The reason I wrote that state-of-charge should be kept between 20% and 80% is because I looked it up and that's what I discovered.

I just looked it up again.

Question​

What kind of battery chemistry does a mustang mach e have?​

Answer​

The Ford Mustang Mach-E can have either a Nickel Cobalt Manganese (NCM) or a Lithium Iron Phosphate (LFP) battery chemistry. The choice of battery depends on the model year and the specific range variant. [...]​

​

Question​

What kind of battery chemistry will a Slate Truck a have?​

Answer​

The Slate Truck will use nickel-manganese-cobalt (NMC) batteries rather than the cheaper lithium-iron-phosphate (LFP) batteries. [...]​

​

Question​

Should an EV with nickel-manganese-cobalt (NMC) batteries be charged to full capacity and/or discharged to near-zero capacity?​

Answer​

For electric vehicles (EVs) equipped with nickel-manganese-cobalt (NMC) batteries, it is generally recommended to avoid charging them to 100% capacity and discharging them to near-zero capacity to maximize battery longevity.​

​

Charging NMC batteries to 100% every now and then is acceptable, but they should not be left at full charge for extended periods.​

​

It is also advised to keep the battery state of charge (SoC) within a moderate range, typically between 20% and 80%, to prevent excessive stress on the battery.​

​

Discharging NMC batteries to very low levels can also be detrimental to their health. Most EVs have built-in battery management systems (BMS) that prevent the battery from being completely discharged, but it is still best to avoid letting the battery drop below 20% if possible.​

​

Regularly charging and discharging NMC batteries within a narrower SoC range, such as between 40% and 80%, is believed to be better for the long-term health of the battery compared to frequently discharging it to very low levels or charging it to 100%.​

​

In summary, for optimal battery life, it is advisable to charge NMC batteries to around 80% and avoid discharging them below 20%, unless necessary for long trips.​

As an EV n00b I can't vouch for the veracity of this. Source is Brave Search. Popup links to web sources are provided in the answers there, but those didn't transfer to here.

I think multiple sources have confirmed that a 20-80% charge cycle is ideal for NMC.

 

[evtruth]

Slate hasn't been exactly clear about the range. It says the smaller battery is "good for 150 miles". Does that mean useable range down to a 20% SOC or is 150 miles at a depleted 52.7 kWh. If the latter, that's just a 120 miles of range if one takes the battery down to 20% SOC. Keep the battery on a trip with DCFC and 20% - 80% depletion cycles is just 90 miles. And that is in temperate weather.

Pretty much every manufacturer does 100% to 0% when stating range. I would bet on that being the same for Slate.

 

[Benjamin Nead]

Pretty much every manufacturer does 100% to 0% when stating range. I would bet on that being the same for Slate.

Yes, true. It's the EPA's test cycle. Just like with gasoline vehicles, it simulates a mix of city and highway driving. And the tabulated range number is based on the availability of a full pack. The EPA numbers are always more stringent (ie: less optimistic) than the European NEDC range estimates. The most wildly inaccurate and overly-optimistic ones are the Chinese WLTP numbers. But any vehicle that's legally sold in the US is going to be tested on the EPA cycle (at least for now.)