Questions on current Como 4

Hi everyone,

I'm 52 and cycling has been one of my life long interest. I live on the east side of Oahu and have some hills to deal with. I've come to the conclusion that I'm ready for a purpose built electric bike to increase my riding enjoyment.

I have a little experience with electric motors and retrofitted a tandem. Unfortunately my wife and kids did not enjoy riding with me. That was a huge waste of money...bike and all. I also put a Bionx on a Bike Friday which ended up cracking the frame in the rear triangle. And then I transferred it over to my Rivendell Atlantis. The Bionx system is good but I rarely used it. I tried it again this weekend and found it didn't have the power I want.

During vacations in Colorado I've rented a number of ebikes. My favorite by far has been the Specialized Como.

Giving that these bikes are in short supply I just purchased a current model Como 4 in XL from the Specialized website. I would prefer to current year Como 5 but don't know the current supply situation. Do the Como 5 models come up for sale often on the website?

The battery of the 4 will be fine since my rides are not that long. I'm more interested in the more powerful motor on the 5. Is the power and speed a noticeable increase between the two?

Thanks,
Dave
 

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Hi everyone,

I'm 52 and cycling has been one of my life long interest. I live on the east side of Oahu and have some hills to deal with. I've come to the conclusion that I'm ready for a purpose built electric bike to increase my riding enjoyment.

I have a little experience with electric motors and retrofitted a tandem. Unfortunately my wife and kids did not enjoy riding with me. That was a huge waste of money...bike and all. I also put a Bionx on a Bike Friday which ended up cracking the frame in the rear triangle. And then I transferred it over to my Rivendell Atlantis. The Bionx system is good but I rarely used it. I tried it again this weekend and found it didn't have the power I want.

During vacations in Colorado I've rented a number of ebikes. My favorite by far has been the Specialized Como.

Giving that these bikes are in short supply I just purchased a current model Como 4 in XL from the Specialized website. I would prefer to current year Como 5 but don't know the current supply situation. Do the Como 5 models come up for sale often on the website?

The battery of the 4 will be fine since my rides are not that long. I'm more interested in the more powerful motor on the 5. Is the power and speed a noticeable increase between the two?

Thanks,
Dave
My wife rides a 2021 Como 4 and I have a 2021 Como 5. I don't notice a difference between the two in most situations. The Como 5 is easier to maintain top speed than the 4 because of the additional gears. I prefer the larger capacity battery on the 5 over the Como 4.
 
Hi everyone,

I'm 52 and cycling has been one of my life long interest. I live on the east side of Oahu and have some hills to deal with. I've come to the conclusion that I'm ready for a purpose built electric bike to increase my riding enjoyment.

I have a little experience with electric motors and retrofitted a tandem. Unfortunately my wife and kids did not enjoy riding with me. That was a huge waste of money...bike and all. I also put a Bionx on a Bike Friday which ended up cracking the frame in the rear triangle. And then I transferred it over to my Rivendell Atlantis. The Bionx system is good but I rarely used it. I tried it again this weekend and found it didn't have the power I want.

During vacations in Colorado I've rented a number of ebikes. My favorite by far has been the Specialized Como.

Giving that these bikes are in short supply I just purchased a current model Como 4 in XL from the Specialized website. I would prefer to current year Como 5 but don't know the current supply situation. Do the Como 5 models come up for sale often on the website?

The battery of the 4 will be fine since my rides are not that long. I'm more interested in the more powerful motor on the 5. Is the power and speed a noticeable increase between the two?

Thanks,
Dave
With that scenery, I will ride with you! :D

Good luck with the decision. I went with Creo SL because of bike weight but I could use a "kick ass" button just once in a while.
 
Hi, is the warranty transferable if I sell it during the warranty period?

I really like a good mirror. Anybody know what kind of mirror Charlie uses on his Como? (See attached photo)

How about those grips he uses? They look sweet. He uses the GS2 model. The GS3 is slightly longer. Has anyone handled these in a store and have a preference?

Thanks
 

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Hi again,

What's a good smallish / medium size saddle bag that won't block the led lights under the saddle?

I found out that the mirror I was asking about in the above post is made by Ergotec.

It does sound like the warranty is transferrable to the next owner. The following is from Specialized:

If you are a subsequent owner, meaning you are the second or later owner, and not the original retail purchaser, the following applies:

2-year Warranty from the date of original retail purchase for the following Specialized-branded Products: frames and framesets, including paint and graphics, components, equipment, shoes, helmets, and Roval wheels. This also includes co-branded suspension parts such as BRAIN equipped forks and shocks, and motors and other drive system components on electric bicycles.

Specialized-branded batteries equipped on electric bicycles: 2-year Warranty from the date of original retail purchase or up to 300 charging cycles, whichever occurs first. The batteries are designed to retain up to 75% of their original capacity during that time.
 
Hi, is the warranty transferable if I sell it during the warranty period?

I really like a good mirror. Anybody know what kind of mirror Charlie uses on his Como? (See attached photo)

How about those grips he uses? They look sweet. He uses the GS2 model. The GS3 is slightly longer. Has anyone handled these in a store and have a preference?

Thanks
We went with the GCS-3 Large purchased from this Ebay seller. About $20 cheaper than Amazon: https://www.ebay.com/itm/202810351014
So far very happy with them.
 
Hi everyone,

I'm 52 and cycling has been one of my life long interest. I live on the east side of Oahu and have some hills to deal with. I've come to the conclusion that I'm ready for a purpose built electric bike to increase my riding enjoyment.

I have a little experience with electric motors and retrofitted a tandem. Unfortunately my wife and kids did not enjoy riding with me. That was a huge waste of money...bike and all. I also put a Bionx on a Bike Friday which ended up cracking the frame in the rear triangle. And then I transferred it over to my Rivendell Atlantis. The Bionx system is good but I rarely used it. I tried it again this weekend and found it didn't have the power I want.

During vacations in Colorado I've rented a number of ebikes. My favorite by far has been the Specialized Como.

Giving that these bikes are in short supply I just purchased a current model Como 4 in XL from the Specialized website. I would prefer to current year Como 5 but don't know the current supply situation. Do the Como 5 models come up for sale often on the website?

The battery of the 4 will be fine since my rides are not that long. I'm more interested in the more powerful motor on the 5. Is the power and speed a noticeable increase between the two?

Thanks,
Dave
Specialised Ebike[AH1]

COMO 5



Having bought a Specialised Como 5 Ebike from Ark Cycles, Brimscombe, Stroud, Gloucestershire, at a cost of £4500, in Feb 2023. It is proving, due to its very expensive batteries very limited endurance, proving to be a major disappointment.

The bike itself being comfortable to ride, it includes such niceties as a radar, which shows dots on the display on the handlebars, indicating what traffic is behind you and automatic gears. It has proved to be useless for the Sunday rides I purchased it for, where accompanied by between 5 to 15 friends, we go off on a day long cycle rides. Stopping along the way to visit cafes and pubs and socialise with other like-minded cyclists along the way.

Taking my first Sunday ride February using the Como 5 Ebike in eco, sports and power modes - as required by the terrain. I ended up having to push the bike home for the last 5 miles, of what would have been a 27-mile ride, after the battery bottomed out.

A battery being the most essential element of any electric bike, instead of its claimed range of 60 miles range in sports mode. The Como 5 has an actual range of around 28 – 32 miles using sports mode on very flat terrain. Using all the modes to suit the terrain, I get 20 – 28 miles. The very hungry Power mode - 7miles

The last 20% of the battery depleting faster than water going down a drain. 5% having been reserved to ensure these batteries don’t go completely flat. The last 20% of the battery vanished in 2 to 3 miles in eco mode.

It being the last 20% of the battery that is the most relied on, especially when coming to the end of a day’s ride. This caught me short on that first Sunday ride. Having run the battery down a number of times since then. The last 20% always reacts the same. Just enough juice left to barely power the lights

Getting it home that day, not being easy, due to the automatic gears not functioning without battery power. The bike remained stuck in one of its lowest gears. Going up inclines like pushing a barrow half full of bricks uphill. Without battery power, the Como 5 proved a tough ride on any terrain other than on the level, or downhill.

.

It being stated in the bike’s manual, the battery loses its capacity to hold a charge by 1.25% per month, or 15% per year, whether it’s in use or not. A battery with a 30-mile range instead of the claimed 60 it’s supposed to have, will lose its capacity twice as fast. After all, it will need to be charged twice as many times.

So, with its present capacity to hold a charge set to shrink by between 20% and 30% before this year is out. I am most certainly not prepared to pay £1000 to replace one dud with another such dud. ABSOLUTELY NOT – NO - NO - NO. That’s going to leave me with an expensive, very useless Ebike in less than a year.

Stan, the person who suggested I do this review after test riding the bike for 25 miles himself. He has calculated it will cost him considerably less for petrol, tax and insurance using his 250cc motorcycle to travel the 200 miles to and from work each week, than it would cost doing around 100 miles a week using this Ebike.

With most Ebikes in the £4.500 to £5.500 range being capable of around 70 - 90 miles in sports mode. Even a Halfords cheapy with a wheel motor and a battery on the rack, can boast better mileage than this Specialised dud. I know, because the two Halford Ebikes used on that ride back in February, were still going strong when the Como 5 conked out.

Having taken the bike back to the Arc Cycles shop, where I complained about the batteries lack of performance. I was surprised when both the mechanic and sales persons tried convincing me this was probably normal. Due the mechanic stated, to the bike having a radar and automatic gears. Having disabled the radar and the front light, (not the gears) it made little or no impression on the battery’s terrible performance.

The online Specialised Turbo Range Calculator: indicating this bike should have a range of around 60 miles in sports mode on level terrain, for a man of my size (I had reviewed and checked this before I purchased the bike) It is instead is proving to be more like one of those Laptops, which last half the time they are supposed to when powered by battery. Unlike Ebikes however, laptops can still be used while they are charging, and you don’t have to push them miles home when the battery conks out.

The mechanics attitude at Arc Cycles, indicating I should accept the poor milage for this bike as the norm. Striking me as being his usual response to complaints of this kind. It is natural to conclude Specialised bike batteries are in the main - despite being very expensive - very very poor performers.

Coincidentally, concerning batteries, I was visiting a supermarket recently when I met a friend who had just purchased a new bike for himself. This one having a Bosch motor and Bosch batteries. He had, he informed me, already done 45 miles on a full charge, with the display indicating the battery was capable of covering another 45 miles in sports mode.

A replacement Bosch battery for his bike, being capable of 1200 charges (not the very limited 300 charges of the fast-depleting Specialised battery) It costs £750 and is not only much cheaper and much more powerful than its Specialised counterpart. It will also over the next several years, save its owner thousands of pounds by not having to be replaced annually.

I still have an old Kalkhoff bike. (Nine years old now) and while it is proving impossible to get spare parts for it. Despite its age, its battery is still capable of outperforming the two-month-old Como 5 battery.

The Kalkhoff being the bike I must use, if I want to continue the Sunday rides. Just to avoid having to push the Come 5 home for the last 5 to 10 miles. (At 75 it can be quite tiring) I have it seems, been left with a right lemon where the very short-range, very expensive to run, Specialised Como 5 is concerned.

The Como 5 going back to the shop on Tues 25th of April, to fix the back LED light which failed within a month of my purchasing the bike. They will also, I have been informed, check the battery.

The female assistant in the shop having suggested the first time I returned the bike; I should try riding it without the battery if I wanted more mileage. (I would have bought a standard mountain bike if I intended doing that) This completely unhelpful suggestion made me realise what I might be up against when dealing with them.

Rather than spending a fortune over the next ten years, regularly replacing batteries which will undoubtedly end up costing you way more than your Specialised Ebike did – anyone reading this should avoid purchasing a Specialised Ebike.



Afterthought​



What do you think would happen if one of the Arc Cycles staff purchased an electric car with a purported range of 200 miles, only to discover after using it a few times it only had a range of 100 miles.

Would they say “That’s ok, that seems normal.”

Of course not, that car would be back to the dealers faster than you can blink.

I am quite sure the same would apply to this Ebike, if one of them had purchased it.







[AH1]O 5
 
Specialised Ebike[AH1]

COMO 5



Having bought a Specialised Como 5 Ebike from Ark Cycles, Brimscombe, Stroud, Gloucestershire, at a cost of £4500, in Feb 2023. It is proving, due to its very expensive batteries very limited endurance, proving to be a major disappointment.

The bike itself being comfortable to ride, it includes such niceties as a radar, which shows dots on the display on the handlebars, indicating what traffic is behind you and automatic gears. It has proved to be useless for the Sunday rides I purchased it for, where accompanied by between 5 to 15 friends, we go off on a day long cycle rides. Stopping along the way to visit cafes and pubs and socialise with other like-minded cyclists along the way.

Taking my first Sunday ride February using the Como 5 Ebike in eco, sports and power modes - as required by the terrain. I ended up having to push the bike home for the last 5 miles, of what would have been a 27-mile ride, after the battery bottomed out.

A battery being the most essential element of any electric bike, instead of its claimed range of 60 miles range in sports mode. The Como 5 has an actual range of around 28 – 32 miles using sports mode on very flat terrain. Using all the modes to suit the terrain, I get 20 – 28 miles. The very hungry Power mode - 7miles

The last 20% of the battery depleting faster than water going down a drain. 5% having been reserved to ensure these batteries don’t go completely flat. The last 20% of the battery vanished in 2 to 3 miles in eco mode.

It being the last 20% of the battery that is the most relied on, especially when coming to the end of a day’s ride. This caught me short on that first Sunday ride. Having run the battery down a number of times since then. The last 20% always reacts the same. Just enough juice left to barely power the lights

Getting it home that day, not being easy, due to the automatic gears not functioning without battery power. The bike remained stuck in one of its lowest gears. Going up inclines like pushing a barrow half full of bricks uphill. Without battery power, the Como 5 proved a tough ride on any terrain other than on the level, or downhill.

.

It being stated in the bike’s manual, the battery loses its capacity to hold a charge by 1.25% per month, or 15% per year, whether it’s in use or not. A battery with a 30-mile range instead of the claimed 60 it’s supposed to have, will lose its capacity twice as fast. After all, it will need to be charged twice as many times.

So, with its present capacity to hold a charge set to shrink by between 20% and 30% before this year is out. I am most certainly not prepared to pay £1000 to replace one dud with another such dud. ABSOLUTELY NOT – NO - NO - NO. That’s going to leave me with an expensive, very useless Ebike in less than a year.

Stan, the person who suggested I do this review after test riding the bike for 25 miles himself. He has calculated it will cost him considerably less for petrol, tax and insurance using his 250cc motorcycle to travel the 200 miles to and from work each week, than it would cost doing around 100 miles a week using this Ebike.

With most Ebikes in the £4.500 to £5.500 range being capable of around 70 - 90 miles in sports mode. Even a Halfords cheapy with a wheel motor and a battery on the rack, can boast better mileage than this Specialised dud. I know, because the two Halford Ebikes used on that ride back in February, were still going strong when the Como 5 conked out.

Having taken the bike back to the Arc Cycles shop, where I complained about the batteries lack of performance. I was surprised when both the mechanic and sales persons tried convincing me this was probably normal. Due the mechanic stated, to the bike having a radar and automatic gears. Having disabled the radar and the front light, (not the gears) it made little or no impression on the battery’s terrible performance.

The online Specialised Turbo Range Calculator: indicating this bike should have a range of around 60 miles in sports mode on level terrain, for a man of my size (I had reviewed and checked this before I purchased the bike) It is instead is proving to be more like one of those Laptops, which last half the time they are supposed to when powered by battery. Unlike Ebikes however, laptops can still be used while they are charging, and you don’t have to push them miles home when the battery conks out.

The mechanics attitude at Arc Cycles, indicating I should accept the poor milage for this bike as the norm. Striking me as being his usual response to complaints of this kind. It is natural to conclude Specialised bike batteries are in the main - despite being very expensive - very very poor performers.

Coincidentally, concerning batteries, I was visiting a supermarket recently when I met a friend who had just purchased a new bike for himself. This one having a Bosch motor and Bosch batteries. He had, he informed me, already done 45 miles on a full charge, with the display indicating the battery was capable of covering another 45 miles in sports mode.

A replacement Bosch battery for his bike, being capable of 1200 charges (not the very limited 300 charges of the fast-depleting Specialised battery) It costs £750 and is not only much cheaper and much more powerful than its Specialised counterpart. It will also over the next several years, save its owner thousands of pounds by not having to be replaced annually.

I still have an old Kalkhoff bike. (Nine years old now) and while it is proving impossible to get spare parts for it. Despite its age, its battery is still capable of outperforming the two-month-old Como 5 battery.

The Kalkhoff being the bike I must use, if I want to continue the Sunday rides. Just to avoid having to push the Come 5 home for the last 5 to 10 miles. (At 75 it can be quite tiring) I have it seems, been left with a right lemon where the very short-range, very expensive to run, Specialised Como 5 is concerned.

The Como 5 going back to the shop on Tues 25th of April, to fix the back LED light which failed within a month of my purchasing the bike. They will also, I have been informed, check the battery.

The female assistant in the shop having suggested the first time I returned the bike; I should try riding it without the battery if I wanted more mileage. (I would have bought a standard mountain bike if I intended doing that) This completely unhelpful suggestion made me realise what I might be up against when dealing with them.

Rather than spending a fortune over the next ten years, regularly replacing batteries which will undoubtedly end up costing you way more than your Specialised Ebike did – anyone reading this should avoid purchasing a Specialised Ebike.



Afterthought​



What do you think would happen if one of the Arc Cycles staff purchased an electric car with a purported range of 200 miles, only to discover after using it a few times it only had a range of 100 miles.

Would they say “That’s ok, that seems normal.”

Of course not, that car would be back to the dealers faster than you can blink.

I am quite sure the same would apply to this Ebike, if one of them had purchased it.







[AH1]O 5
There's probably something wrong with your battery or motor or, less likely, the IGH. I have a 2022 Turbo Como 3.0 (smaller battery, derailleur gears) and can go 50 miles on a charge without paying any attention to conserving the battery. A recent 25 mile ride with half in turbo mode going 15-18 mph only used 45%.

I looked up my last several rides in the mission control app: Two 8 mile rides at 100% Eco power, 70s cadence, 200% support level, 10.5 mph avg speed the bike used 6 Wh/mile. At that rate 90% of the 530 Wh battery would give 80 miles range. Another 17 mile hillier ride with power as needed to maintain speed up hill, 288% support, 12.3 avg mph, 9 Wh/mile. My range at that rate would be 53 miles. A short 4 mile ride with almost no effort on my part, 350% support, in turbo power, 11.1 avg mph, 14 Wh/mile, range at this rate 34 miles.

Your battery is 34% bigger than mine so your range numbers would be 34% longer. Also note that range is hugely affected by how fast you ride and how much pedaling effort you put in. My rides are all around 10 - 12 mph. That advertised 60 mile range in sport mode makes critical assumptions about speed and rider effort. If you are going 20 mph and letting that powerful bike motor do all the work you will use up the battery MUCH faster. Recording your ride in the MC app will give you the data you need to see if the bike is performing as Specialized advertised (avg speed, support level % and Wh/mile)

BTW, Specialized warrants their batteries to have at least 70% of original capacity after 2 years or 300 charge cycles. Decently cared for Li-ion batteries will not degrade nearly that fast. My battery health still shows 100% after 14 months. I don't often charge it to 100% though and never run it flat - both practices shorten the life.
 
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If you are going 20 mph and letting that powerful bike motor do all the work you will use up the battery MUCH faster.
What is funny is the British e-bikes are limited to 15.5 mph and should be even more economical.
 
Hi Mcdenny

The Como 5 has gone back to the shop today to get the back light fixed. They are also going to test the battery. I will let you know what happens.

What Stefan Mikes said about the 15 mph limit over here helping get more milage. I don’t think that’s so, because its limited speed makes it very hard to access the highest gears. And travelling around in lower gears means lower economy.
 
What Stefan Mikes said about the 15 mph limit over here helping get more milage. I don’t think that’s so, because its limited speed makes it very hard to access the highest gears. And travelling around in lower gears means lower economy.
This is not correct at all. Gearing has nothing to do with the battery economy. There are four principal kind of resistance on any bike (electric or traditional):
  • Rolling resistance resulting mostly from the surfaces ridden and the inflation pressure of tyres. The rolling resistance takes its toll at lower riding speed, and is not increasing with the speed
  • Air drag, which is one of the most serious resistances. It takes its toll when the relative speed of the bike against the air/wind exceeds 15 mph, and it calls for the pedalling power in the third power. Meaning: Whenever your relative speed against the air exceeds 15 mph, the e-bike becomes power hungry. It might happen on a 15.5 mph e-bike only against a significant headwind
  • Potential energy is accumulated as the bike/rider climb a hill. It is one of the most significant resistances, and it depends on the elevation gain, the speed uphill, and the weight of e-bike + rider + cargo. You said @Ade169 your ride was mostly on the flat
  • Loss of kinetic energy on frequent starts/stops, and notably on breaking.
All users of EU/UK e-bikes limited to 25 km/h or 15.5 mph notice significantly increased battery economy because they do not lose a lot of energy to counter the air drag.

For your information Ade, gearing is to keep your pedalling at the proper cadence >70 rpm and has nothing to do with the battery economy.

P.S. When I bought my Vado 5.0, I was irritated with the short battery range too and I was complaining in the very same Fora as you do now. (Only I did not write "don't buy Specialized"). That was because I was riding mostly in the 70/70% Sport mode. Later, I could understand how my e-bike worked and all the energy issues became clear to me. Call is "gaining experience".
 
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  • Air drag, which is one of the most serious resistances. It takes its toll when the relative speed of the bike against the air/wind exceeds 15 mph, and it calls for the pedalling power in the third power. Meaning: Whenever your relative speed against the air exceeds 15 mph, the e-bike becomes power hungry. It might happen on a 15.5 mph e-bike only against a significant headwind

To clarify - aerodynamic drag is proportional to velocity squared, as well as rider size/posture. Yes, higher speeds cause sharply higher drag, but it is a parabolic function without a specific inflection point rather than a hockey-stick style graph.


Sorry, spent too many hours in physics classes decades ago to not chime in... :)
 
To clarify - aerodynamic drag is proportional to velocity squared, as well as rider size/posture.
The power demand is in the third power vs. the relative speed against the air.

Pd = 0.5CdpA*v^3
where:
Pd - power demand
Cd - drag coefficient
p - air density
A - the object frontal area
v - true speed of air.

 
I am quite familiar with Newton's Third Law - For every action, there is an equal and opposite reaction and Einstein’s Theory of Relativity. Niether of which can get this crappy Specilised battery to produced any more milage.
 
Just for fun I duplicated one of the routes I referenced in the Wh consumption statistics in my post #10 above. I pedaled at my comfort level on both rides. I try to keep cadence between 70 to 80 rpm.

100% eco power - my energy input 16 calories/mile; motor consumption 6 Wh/mile; support 195%; AVG SPEED 10.4 mph.

100% turbo power - me 13 cal/mile; motor 13 Wh/mile; support 430%; AVG SPEED 16.2 mph. I was frequently bumping into the 20 mph motor cutout.

Even at 13 Wh per mile you should be able to get around 50 miles range with your bigger battery. If you are going below 15 mph and contributing around 15 cal/mile you should definitely get 50 miles range. If not, your actual battery capacity is not the advertised 710 Wh. That's just physics ;)
 
100% eco power
@mcdenny:
For clarity, what is the Assistance and Max Motor Power in your ECO setting per Mission Control?
Only to make the thing more precise: The Specialized battery is cut off for assistance at 5%, making the effective 710 Wh battery charge equal to 675 Wh.
I'm am sure your experiment has worked for your own leg power but not necessarily for the @Ade169 leg input. Let me explain.

My legs are bad because of the medical condition, and my own leg input into a long ride is 7.6 kcal/mile, which is less than half of yours. I was on my gravel club ride in March, and I played the role of the rear guard of that ride. My average speed was 13.8 mph. The average assistance was 32.1/100% (I was using an equivalent of MicroTune). 633 Wh of the battery power was consumed for a 65.8 mile ride, giving the battery consumption factor of 9.62 Wh/mi.

Now, that ride proved that with using my assistance level and my low leg power/input, a rider with the 710 Wh battery (of 675 Wh usable charge) should easily do a Metric Century with a Como 5.0 in the Eco mode.

I recommend to @Ade169 to ask the Specialized LBS showing him the full battery charge figure. It does not need to be 710 Wh (new batteries rarely contain the nominal charge) but if it turns out the new battery has the capacity of, say, 600 Wh then the battery shall be replaced per warranty.

However, if the battery charge is close to 710 Wh, then the high energy consumption by Ade's Como can only be explained by his riding style, excessive assistance, adverse road conditions (headwind, steep hills), very low cadence, or totally weak legs (mine are very weak, mind you!)
 
The power demand is in the third power vs. the relative speed against the air.

Correct, and that is also covered in the link I provided.

You'd written about "air drag" though, which is proportional to the square of the speed; and yes the power to overcome it is proportional to the cube of the speed. Doubling speed imparts four times the air / aerodynamic drag and requires eight time the power to overcome it.

My point was that - whether discussing "air drag" or power - the function is a sharply climbing curve rather than having a specific threshold / deflection point like a hockey-stick.
 
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Correct, and that is also covered in the link I provided.

You'd written about "air drag" though, which is proportional to the square of the speed; and yes the power to overcome it is proportional to the cube of the speed. Doubling speed imparts four times the air / aerodynamic drag and requires eight time the power to overcome it.

My point was that - whether discussing "air drag" or power - the function is a sharply climbing curve rather than having a specific threshold / deflection point like a hockey-stick.
Now we fully understand each other, thank you!

@Ade169 thinks he would ride more economically if his Como could be assisted over 15.5 mph: That is fundamentally incorrect. Slow ride = economical ride. He also thinks he should ride in high gear. That is again incorrect. Riding in high gear causes the cadence be very slow, which dramatically decreases the motor efficiency and further reduces the range. On contrary: riding in middle gears at cadence > 70 is the correct way to extend the battery range.
 
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