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Unknown - Ask HJ question ? - Topdude

Just read this question on the Ask HJ page, can anyone make any sense of it ?

Ask Honest John Honest John Ask Honest John » Low battery warning problem, what can I do?

Low battery warning problem, what can I do?

When ?I collected my new lease car last October the salesman told me not to leave the doors or boot open as it would trigger the low battery warning. I had not noticed this on my test drive and the dealership did not advise me prior to my signing the lease.

After a few says I phoned back to ask how to clean the inside of the car and was told 'leave the engine running!'

I have just returned from a holiday and loading/unloading the car has been extremely frustrating as the low battery warning keeps going off as I didn’t leave the engine running (security risk and fuel cost).

Earlier this month I spoke to the service department but they can’t disable any of the electronics that drain the battery. He said the showroom cars batteries are always going flat due to people opening the doors.

Clearly the battery is not fit for purpose.

What can I do please?

Edited by Topdude on 10/07/2022 at 06:50

Unknown - Ask HJ question ? - elekie&a/c doctor
It’s likely there is nothing wrong with the car. Most modern vehicles have electrical systems that will go into “economy mode “ to prevent the battery going flat while the engine is not running. Consumer circuits like windows, wipers , heating and interior lights will shut down until the engine is re started.
Unknown - Ask HJ question ? - bathtub tom

Knowing the make and model may help. I wonder if it's a hybrid.

Unknown - Ask HJ question ? - Andrew-T
It’s likely there is nothing wrong with the car. Most modern vehicles have electrical systems that will go into “economy mode “ to prevent the battery going flat while the engine is not running. Consumer circuits like windows, wipers , heating and interior lights will shut down until the engine is re started.

What a typically silly situation - when everyone is being told to avoid wasting energy, it can be difficult to clean inside a car without flattening the battery unless the engine is running ! Ridiculous.

Unknown - Ask HJ question ? - Bromptonaut

I'd want to ask some more questions of the car's owner, the first of which, is it a hybrid? has already been asked. Has the battery actually gone flat?

How does this battery warning manifest itself? Nothing on either of my cars shows warnings or cautions until the ignition is on at least in the Accessories setting. The Berlingo will show a flashing aspect on the battery/generator warning light but this just tells me it's in economy mode and has locked out things like the radio or wipers until the engine is started.

If interior lights or exterior lights are left on both it and the Skoda will shut hem down rather than letting the battery discharge totally.

As per the reply the issue needs further exploration through the dealer and/or lease company.

Unknown - Ask HJ question ? - Engineer Andy
It’s likely there is nothing wrong with the car. Most modern vehicles have electrical systems that will go into “economy mode “ to prevent the battery going flat while the engine is not running. Consumer circuits like windows, wipers , heating and interior lights will shut down until the engine is re started.

What a typically silly situation - when everyone is being told to avoid wasting energy, it can be difficult to clean inside a car without flattening the battery unless the engine is running ! Ridiculous.

Indeed - it's like telling people to hold their breath to conserve Oxygen! The whole point of car doors and boot lids is for them to be openeed - whilst the car is off! :-)

Unknown - Ask HJ question ? - RichT54

Perhaps it was a Mazda?

While searching, I found the following US service alert (PDF):

https://www.mazda3revolution.com/attachments/sa-005-21-pdf.281091/

I like the section where it says:

Allow the engine to idle for a minimum of 5 minutes before customer receives the
new vehicle or picks up the vehicle after service to prevent the warning message
from coming on.

Edited by RichT54 on 10/07/2022 at 11:34

Unknown - Ask HJ question ? - Bromptonaut

Allow the engine to idle for a minimum of 5 minutes before customer receives the
new vehicle or picks up the vehicle after service to prevent the warning message
from coming on.

I think this is a case of over cautious settings. If the battery were seriously at risk then I doubt 5 minutes at idle would sort it out.

Unknown - Ask HJ question ? - Terry W

On my car the stop/start system disables itself - apparently due to a low battery.

It is not remotely flat - it is probably just outside of whatever criteria the software uses to send the message - eg: if the climate control is on high.

Not a problem as I don't like stop/start anyway so usually disable it in traffic.

Unknown - Ask HJ question ? - Bromptonaut

On my car the stop/start system disables itself - apparently due to a low battery.

The Fabia will do that. Interrogating the system generates a message about high electrical demand.

The battery did go flat at one time and I was getting additional messages to recharge it my driving. This was during the pandemic lockdown when I was working from home and herself was doing the shopping.

It did eventually fail dead and would not recharge even with a proper condition/charge cycle.

Unknown - Ask HJ question ? - Engineer Andy

On my car the stop/start system disables itself - apparently due to a low battery.

The Fabia will do that. Interrogating the system generates a message about high electrical demand.

The battery did go flat at one time and I was getting additional messages to recharge it my driving. This was during the pandemic lockdown when I was working from home and herself was doing the shopping.

It did eventually fail dead and would not recharge even with a proper condition/charge cycle.

I do remember a thread a while ago about this issue to do with the Toyota Yaris hybrids, whereby a good number of owners (often elderly people) use them for frequent short runs to the shops which continually discharge the main battery, flattening that, and also never having sufficient time/distance to recharge either the main or hyrbid batteries.

Large bills ensue to replace them at far more regular intervals than if the cars had been specifically designed to cope with such evetualities, which in today's world are increasingly common.

It's the sort of driving pattern that my elderly parents do.

Perhaps a PHEV range extender where the ICE system just recharges the EV battery and does not (whether directly or indirectly via an inverter*) may be the solution?

* John Cadogan was looking at the new Qashqai electric-ish car and had a good amount of choice words to say about the [in his opinion] poor design in terms of how its to be used vs efficiency (and alternatives) and possible safety-realted issues.

Unknown - Ask HJ question ? - edlithgow

New cars suck...er...power.