No, Where does it says it was being driven? What logic is if EV car not being charged at home = it is being driven. You cannot park the car , lock the car without charging the car?



Yes , you leave the car parked and not charged with sentry mode on for eg you leave it for a week at 30% charge , after it reaches 15% charge it will not charge the battery while it is parking.

Same story here when parked.

It's funny the whole thread is about jumpstarting their 12V battery and not being able to start their car, which means they can't even start their car in the first place but you chose to believe the narrative that BYD will keep the aircond, allow you to blast the music , allow you to drive at 100km/h but not charge the 12V while on the move.

Macam Squid Game, Winner entitled a certain amount of money from the Jackpot. But then Squid Game offered new challenge. Guess what, that victim will grab it because it's human nature. Nothing is enough.

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No. Where does it says it was being parked.?

Where does the whole thread say it is about jumpstarting the 12V battery after BYD Atto 3 cars broke down while being parked and not while being driven.?

Fyi, .......

https://evpowerhouse.com.au/blog/byd-atto-3...ems-and-issues/ - Common BYD Atto 3 Problems and Issues - 29 Dec 2023
.... Power failure issue

Some owners have experienced a terrifying situation – the car suddenly losing power with no warning. The culprit? A depleted starter battery with a critically low voltage reading. While a simple recharge solved the immediate issue, concerns remain about customer support’s handling of battery replacement options. ...

.... Owners have also noticed the 12V battery draining more quickly, particularly when the main traction battery has a low charge. While the exact cause remains under investigation, these two issues could be pointing towards a potential problem with the car’s electrical system. ...

12V battery issue

Frequent complete discharges of the 12V battery, leaving the car stranded, are a recurring problem. While trickle charging offers a temporary fix, the battery quickly drains again. Owners are seeking information about the 12V battery’s charging cycle in EVs and when it receives a top-up from the main battery. ...
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This post has been edited by lurkingaround: May 28 2025, 01:46 PM

So are you saying the problem that he is having is while driving ? So you cannot understand from his text that it is happening during standby mode?


lockout = James May was outside the car and cannot get into the car. Not driving. Cannot understand this ?


So are you saying you cannot understand what change into gear or locked in P means? So you conclude that they are driving at 100km/h based on this statement ? LOL

This post has been edited by Drian: May 28 2025, 02:18 PM

give him huge discount for sealion, he love atto3

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AFAIK, that thread says the 12V battery in BYD Atto 3 cars could fail while parked or while being driven = breakdowns. From your geekzone forum link, .......

arthurgeek

I then found that there have been a lot of breakdowns due to 12V battery failures in the new BYD Atto 3, which arrived in NZ around August 2022. Some members of a FB group have reported that the battery management system (BMS) of the Atto 3 has not been adequately charging the 12V battery and just about every day an owner reports that their Atto has broken down due to the 12V battery failing. Apparently BYD has explained that when the vehicles were being freighted to NZ the batteries discharged to lower than expected levels and that the BMS couldn't recharge the batteries back to full capacity. The BMS is apparently being upgraded to check the 12V battery more often and charge it up for double the amount of time, and an OTA is due out soon.

So, do all EVs have problems with keeping the 12V battery fully charged, and if so, what are the main reasons why this is happening? Should EV owners invest in a battery charger and a jump-starter and check the state of charge of the 12V battery regularly?

SteveNXZ

.... The BMS is not aggressive enough in checking the state of the 12V battery and recharging it from the traction battery. BYD are releasing a firmware fix for this issue in early February. This will increase the frequency of checks and top-ups, but doesn’t mention whether the low voltage threshold (around 11.5V) will be changed. ...

Gemini AI Overview

The traction battery charges the 12V battery in electric vehicles when the 12V battery voltage drops below a certain threshold. This typically occurs when the car is not plugged in and parked for a few days, or when the 12V battery is not being adequately recharged by regenerative braking. The Hybrid/EV Powertrain control module (HPCM2) monitors the 12V battery and will initiate a "battery maintenance" mode to charge it if necessary.

Please address the points raised by my evpowerhouse link above.
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Please show me exactly where in the evpowerhouse link above said that low 12V battery would cause an emergency brake from 100km/h in 6 seconds.




Nope. There is nothing in the statements that you showed or highlight above that suggest that the 12V battery would cause an emergency brake from 100km/h .
Also you yourself assume breakdown = must be driving. That is your own assumption in an attempt to try to use the paragraph to support your statements.

Yes . The BMS is not agressive enough in checking the state of the 12V battery when the car is parked. Byd released a firmware fix to increase the frequency of checks and top-ups when the car is parked and standby. Nothing in this statement shows that 12V battery will cause an emergency brake. Why are you highlighting random statements that doesn't support what you are claiming.

12v battery also cannot manage liao, hot to mange the 60kwh battery o, beiyandiu lorrrrr

if ICV or even Hybrid SLA battery is about to die, the car might show signs of slow to crank and start or in my City H case just say " Transmission is recalbrating".
No such monkey business pretend all is good until it is not and leave you stranded middle of the overtaking lane of the highway.

so much copium

Isn't the above article statement self-explanatory, ie a terrifying situation like an emergency brake from 100km/h in 6 sec due to low 12V battery.?

AFAIK, the traction battery recharges the 12V battery periodically whenever the BMS detects the latter has low voltage, eg <11.5V, whether the EV car is parked or is parked and being charged or is being driven, ie not only when parked. Your claim has no computer logic, ie your claim that the BMS does not periodically check the 12V battery for low voltage and recharges it when needed while being driven. .......

Gemini AI Overview

While driving an EV, the auxiliary battery directly powers the headlights, climate control system, and sensors. This battery is also known as a 12-volt battery, according to the Department of Energy (DOE). The main traction battery powers the electric motor, while the auxiliary battery handles the accessories.

More similar info saying 12V battery directly powers accessories while driving, not the traction battery, .......

https://www.reddit.com/r/electricvehicles/c..._all_the_stuff/ - Is there a separate battery for all the stuff that a normal car battery uses electric for? - 8 months ago
lucky1pierre

I've seen a few posts recently that have got me thinking - my EV has what looks like a traditional battery under the bonnet. I've assumed that this is for things like windows, lights, screens etc and that the battery pack under the vehicle is for power only.

Is this accurate or am I wildly missing the mark here? Does the battery pack supply absolutely everything?

(104 comments)
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This post has been edited by lurkingaround: May 28 2025, 09:53 PM

They say byd always have promotions on their cars, the lowest price for Sealion is what so far??

Inaccurate The article did not say the terrifying situation is an emergency brake from 100km/h in 6s.
Can you show me exactly the full statement and sentence stating that the terrifying situation is an emergency brake from 100km/h and not create from your own stories or assumption.





Inaccurate The BMS detection for low voltage is only for when the car is parked and standby. When the car is being driven , a constant voltage of 13.8V is being delivered to the battery which means is continuously charge. No waiting for it to be low voltage .
It is 2 different modes for 2 different scenarios. Try to think why they use periodic mode for parked and not for driving.

Here is a guy who logs his battery voltage for the past 3 days and he clearly explains what is going on. And it perfectly shows that during driving the voltage is constant 13.8V which means continuously charging.





This post has been edited by Drian: May 29 2025, 01:59 AM

https://forum.lowyat.net/topic/5521715


Above repost of the original incident which is quite similar to that descibed as a "TERRIFYING SITUATION" in my evpowerhouse link, ie power failure with no warning due to faulty 12V battery ---> door sensor malfunction ---> computer falsely sensed doors as open while driving ---> auto activation of EPB and power shutdown.

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AFAIK, what you have shown above is for normal operation of an EV car with a normal 12V battery, ie not for abnormal operation and/or with a weak (eg old) or failing 12V battery.
....... The 12V battery has a normal life span of only about 1 year(.?).

Eg if driving at night in the dead of winter (below 0*C) with the headlights on and heaters at full blast, the normal 12V battery's voltage would definitely drop below 11.5V due to heavy load or power draw = requires heavy recharging by the traction battery = EV car range drop by 30% to 50%. .......

And from your geekzone forum link, ie one BYD Atto 3 car breaking down per day due to failing 12V battery caused by an abnormally long ship-freight from CCP China to NZ, .......

arthurgeek

I then found that there have been a lot of breakdowns due to 12V battery failures in the new BYD Atto 3, which arrived in NZ around August 2022. Some members of a FB group have reported that the battery management system (BMS) of the Atto 3 has not been adequately charging the 12V battery and just about every day an owner reports that their Atto has broken down due to the 12V battery failing. Apparently BYD has explained that when the vehicles were being freighted to NZ the batteries discharged to lower than expected levels and that the BMS couldn't recharge the batteries back to full capacity. The BMS is apparently being upgraded to check the 12V battery more often and charge it up for double the amount of time, and an OTA is due out soon.
.

This post has been edited by lurkingaround: May 29 2025, 02:23 PM

sensor faulty update wat rancao .. low quality shit hardware already broken, how to fix with software update

only seisohai ev lover say very reliable no parts to go wrong , no need fix , no need service , no maintenance ,

later 1 door sensor failed bini anak all hamkachan baru happy love ev somemore..

niama ccp sapkoker ev lover still no money buy ev hari hari tokok ask other white mice buy ev but sendiri no buy

unker PowerSlide also till now still belom beli ev ka ? lol

[Inaccurate . No it is not similar.
The article did not say the terrifying situation is not similar emergency brake from 100km/h in 6s.
Can you show me exactly the full statement and sentence stating that the terrifying situation is an emergency brake from 100km/h and not create from your own stories or assumption.
Can you tell me also why did you create the link door sensor malfunction is due to 12V battery.



If it was failing it would have not been able to start. And it shows that you were wrong when you made the statement below.





Irellevant statements. So? it drops the range so ? of course you're using power to heat up the cabin. Also EV uses heatpump which is powered by the main traction battery not 12V.
Even the irrelevant statements that you make is not accurate.


And... what does it prove? Are you claiming because the 12V battery fail in an abnormally long ship freight from China therefore it must be the same rootcause here? Critical thinking is lacking don't you think.
You are currently randomly showing 12V failures and then say see if other people 12V can fail , this must be the exact rootcause of the BYD atto3 failure in the malaysia scenario.


This post has been edited by Drian: May 29 2025, 02:55 PM

No, it's very similar lar.

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Fyi, .......

Gemini AI Overview

While driving an EV, several accessories are powered directly by the 12V battery. These include essential components like power steering, brakes, power windows, and central locking, ensuring they function even if the main traction battery fails, according to The Straits Times. Additionally, the 12V battery powers various low-power accessories like dash cams, USB chargers, and interior lighting. ...

https://www.midtronics.com/blog/factors-aff...ttery-life-evs/ - Factors that Affect 12V Battery Life in EVs - 31 May 2024
.... The HVAC fan, however, is powered by the 12-volt system. It’s a much smaller draw on the battery, but it does pull it from the 12-volt side. And whether you’re using the air conditioning or the heater, when the fan is on, it’s drawing down the 12-volt battery. Keep in mind that it’s there to be used and make you comfortable, and we’ll discuss the long-term effects later. ...

Each camera, lidar, ultrasonic sensor, and radar requires power consumption, as do braking actuators, steering actuators, and so on. The 12-volt battery is in place primarily for safety power capacity, powering these functions.

Again, each of these sensors and modules requires a very small amount of energy to operate, but cumulatively, they can begin to affect the amount of power drawn by the 12V system. ....

Driving with Low Traction Battery Charge

One of the most prevalent killers for 12V batteries in EVs is when a traction battery is regularly driven with a low charge. Some carmakers have built in a ‘safeguard’ that prevents energy from being drawn from the traction battery for 12-volt accessories like heated seats when the charge is below 20 or 30%, and the step-down converter is also turned off or regulated. ....
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It proves that the 12V battery in EV cars can fail for various abnormal reasons, resulting in car breakdowns while parked or driving, .......

https://insideevs.com/news/752720/ev-12-vol...ttery-problems/ -
The big, expensive batteries are dead reliable. It's the puny 12-volts that are causing problems. - 6 March 2025
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This post has been edited by lurkingaround: May 29 2025, 04:39 PM

this car cannot pakai for stunt moves

full speed and open door to jump out

open door terus emergency brake

101 in E&E / mechatronic engineering is to never have single point of failure and should be fault-tolerant and fail safe even if it fails.

For this case it seems that the system is designed to failsafe but not fail-operational. I guess BYD is more conservative and will shutdown once the system detect a fault even if it's a minor one.

They can improve their system by making it fail gracefully. At least keep the electric power steering, brake booster and ESP working until it stops completely.

No it's not.

Yes but in the case of the current atto3 it is not. You can't take another incident and say this atto3 which happen in Malaysia must have the same issue.
Your gemini AI has been proven wrong many times. Why are you still using it when it is so unreliable?