EX Custom iOS/Android App

[Erwin P]

Mmm yes this is a rather hard one. I can't really see what i did different than you.

The dealer that has to do the repair for me just ordered the battery.

 

[Theo]

Yes it has a contactor on the battery but even with the connector disconnected the bike activates the contactor... I think this is also a pretty big safety flaw. in fact with the power connector disconnected the LED remains solid green for a long time.

In the battery replacement video tutorial, they first disconnect the CAN BUS and only afterwards they disconnect the orange power cable. I can't see whether that cable was connected while you were using that multimeter. Was it disconnected?
In which state was the bike when you disconnected the power cable? I think it's supposed to be off or at least in standby, not on, when you do that and probably, even if it's on, it would turn off after the CAN BUS disconnection.

And sorry for being a broken record, but let's please still remind everybody that the typical layperson shouldn't do things like measuring the battery voltage. I see you were using a multimeter with the writing "600V CATIII" that hopefully is suitable and you said you are knowledgeable of lithium batteries. What if someone uses some cheap multimeter without protection or somehow ends up closing the circuit and being electrocuted?

 

[Erwin P]

Nothing wrong with a cheap multimeter. They can do voltages way above what that battery does. Just don't put it in Amps, but that goes for expensive ones as well. But even on the cheap ones the fuse will do anything except for very high voltage situations (wich a 400V DC isn't).
The examples of multimeters exploding is with 10kV systems with huge short circuit amps (i happen to work in these kinds of enviroments).

In the end it's just a big, but not huge battery. Sure it holds quite a bit of energy, but so does the elektricity net in your home (wich every idiot works with daily) at 230V (or even 400V) that while AC is more harmfull (at the same voltage) to the body than DC. However on the Stark you need to touch both + and - to get a shock, on your home net that has an earth connection just 1 cable will do.
The 16A circuit breaker won't save you. The earth leakage circuit breaker might be in time, but that's also depending on how well the earthpin etc etc are.
Compared to your home installation this is a pretty safe setup.

Closing the circuit will not end up with you being electrocuted. It might in the worst case start a fire, but i would be very surpriced if it didn't have some over-current safety. If you really, really wanted to be elektrocuted you could opt to put 2 screwdrivers in the battery and grab that, but well... By then it might just be Darwin kicking in.

 

[brongle]

@Erwin P

Yes it has a contactor on the battery but even with the connector disconnected the bike activates the contactor... I think this is also a pretty big safety flaw. in fact with the power connector disconnected the LED remains solid green for a long time.


This is the final answer of stark for my ticket:
..............,......
Support (Stark Future)

September 19, 2025, 1:49 PM CEST

Hello,

We've checked and everything seems to be within normal operating ranges.

On one of our last rides, we saw a 53% battery drain in 60 minutes of use, which is normal.

Regarding your comment about the bike draining in the garage, this is expected. When in standby mode (flashing red every 10 seconds), the bike's internal systems, such as the battery and inverter, continue to work and can consume up to 2% or 3% of the battery daily.

If there's any other issue we can help you with, please let us know.

Thank you very much.

Best regards,
.............................
I don't know what to do... should I be more aggressive and tell them that I know it has two dead groups, showing the photo that it doesn't charge at more than 409 volts??... do you know at what voltage your Stark normally charge at maximum voltage??? Maybe they leave a margin for longer battery life, maybe 4.175V per cell???

Should I ask them for a certificate of the cell voltages??

Well at this point its up to you and how hard you want to play the game of "will Stark help me or void my warranty". Since your coming up on the end of your warranty it might just be worth it to push them harder. I think its reasonable for you to have measured the pack voltage yourself, and there is no reason at full charge it shouldn't be within a few volts of 420, so maybe its fair to start with that? I'm not sure how much luck you'll have here if the person your talking too isn't very technical, but maybe at least worth a try.

 

[Erwin P]

I think i wouldn't mention the app.
My back-up plan if i didn't get a new battery was that i would extend the warranty. Sure that battery will go someday, 1000 is less than 3000 and it adds some resale value.
Maybe an option for you?

 

[OpaTsupa]

This discussion about quietly failing batteries and the legality of just looking at your own property deserves a broader audience.
I expect some people are missing it in this specific topic, but probably not the Stark company.

They should be pressured that using a third party app to unobtrusively observe data is not voiding the warranty in any meaningful way.

I also call bullshit on standing by the bike on a video call while they 'gather data'. They can access it all at any time, and they can certainly see a bad battery. It's just a legal farse to cover themselves.

 

[brongle]

This discussion about quietly failing batteries and the legality of just looking at your own property deserves a broader audience.
I expect some people are missing it in this specific topic, but probably not the Stark company.

They should be pressured that using a third party app to unobtrusively observe data is not voiding the warranty in any meaningful way.

I also call bullshit on standing by the bike on a video call while they 'gather data'. They can access it all at any time, and they can certainly see a bad battery. It's just a legal farse to cover themselves.

Yes unfortunetly its still a bit of a complex issue especially when you consider the multi-nationality and jurisdiction of Stark as a company. In Stark's defense I don't think they've ever cancelled someones warranty for something silly, and we don't really know their stance on third party tooling until someone asks (or they find out).

I believe they mostly schedule a video call because the bike does need to be on and in gear to record and upload the full suite of telemetry data (at least from what I've seen). It's also quite useful to have a human in front of the bike that can press buttons, push the throttle, and see exactly what is happening while communicating that directly to Stark's support staff.

 

[Erwin P]

I agree with @brongle here.
Downloading data does require the bike to be in a certain mode. A human helping and describing the issue is a big plus as well.

We actually don't know their stance on these kind of apps. Only lead we have is the E clutch voiding the warranty, wich i think is understandable since it writes to the bike and is not tested by them.
It's just that nobody really wants to find out.

So far they have been good on me regarding warranty.
Lets also remember we are dealing with a very small very fast growing company here. From a couple of dozen to 400 employees in about 3 years doesn't give for the most experienced crew. I work in a factory as Proces Operator and our internal learning program takes about 4 years. Just to give you a sense of scale of schooling they have to get to their crew.

Not every negativity is born from evil or greed.

 

[ambrose1320]

Bonjour, je recherche un adaptateur pour Arkenstone vers iPhone SE 2020

@bernardo77

 

[Yieloficial]

@brongle

Hello I have downloaded the diagnostic file from your app, I want to know if this ODO measure is in miles or km, and if it is the total distance of the bike???... The measure on the phone is really different.

 

[brongle]

@brongle

Hello I have downloaded the diagnostic file from your app, I want to know if this ODO measure is in miles or km, and if it is the total distance of the bike???... The measure on the phone is really different.View attachment 14725

Its in meters

 

[Yieloficial]

Its in meters

So, this only refers to the last ride??

Is there any way to check the total usage of the bike?

 

[brongle]

So, this only refers to the last ride??

Is there any way to check the total usage of the bike?

It’s the total usage. Are you on an MX? And if so do you have a rough idea of how much usage its had?

 

[Bernardo]

Bonjour, je recherche un adaptateur pour Arkenstone vers iPhone SE 2020

@bernardo77

Bonjour ! Malheureusement, je n'ai pas d'adaptateur pour vous. Je pense que les adaptateurs seront produits un par un dans les laboratoires 3D.
Regardez simplement Thingiverse et les autres plateformes et le fil de discussion sur les pièces 3D.

Stark Varg 3D files

I thought an post of 3d files we could share would be perfect for more people then just me :) Please share if you got ideas or files :-)

electricdirtriders.com

B.

 

[Yieloficial]

Yes, I bought it secondhand and the bike had a 48-hour, 280-km usaage, two months ago. But the guy didn't use the cell phone on the bike.

13,694 meters does not make sense since it would only be 13km in total.

 

[brongle]

Yes, I bought it secondhand and the bike had a 48-hour, 280-km usaage, two months ago. But the guy didn't use the cell phone on the bike.

13,694 meters does not make sense since it would only be 13km in total.

I don’t think the odometer was a feature on MXs until firmware 1.2.8 (or maybe a bit earlier revision, hard to say). I assume Stark realized during the EX development they needed a real odometer to be compliant, and adjusted the motor controller to track individual revolutions and extrapolate distance traveled from the gear ratio.

If he didn’t ride with the phone there is likely no way to really know, although its possible Stark has other internal data about bike usage. The number you saw when buying the bike would have already been very inaccurate if it was ridden regularly without the phone.

I don’t have an MX so I can’t test but itd be nice to know the odometer is actually working (e.g. if you ride now does the number go up a reasonable amount?) and we are just missing historical data.

 

[brongle]

I stole Bernardo's iPhone 3D print and modified it to fit the bigger Pixel9, and it fits great. Unfortunately, the wireless charging for the phone has a very small hitbox. I need to shift everything over roughly 10mm and hopefully that will make the phone charging happy. But regardless of the phone placement, really liking the app. The initial data, the temp readings tend to show 32 degrees F, but once I start moving, they give more realistic numbers. Would it be possible to add a trip meter?

Trip meter is now added and available on iOS, the Android build is still stuck in review but will probably be out sometime this week. Pretty simple, pressing on it gives you an option to reset. Doesn't show anywhere but the dashboard for now.