Author Topic: Flat battery (my fault).  (Read 19314 times)

davejazz

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Flat battery (my fault).
« on: April 05, 2024, 09:47:10 AM »
As we will be doing a 250 mile journey this weekend, I thought I would get the car prepared. By “prepared” I mean my fortnightly check of the tyre pressures. Into the Velcro cubbyhole in the boot I go, to retrieve the electric pump, and after connecting it, I give two stabs on the engine start button, without touching the brake pedal, (which would start the engine), and I now have power to the pump. So I set off on my journey to the four corners of the car, taking care to accurately, adjust the pressures. I do spend longer than average doing this, as I find that I do not have to recalibrate each time, at the end, (as the handbook recommends).
So, job done, I disconnect the pump and turn off the ignition, as I do each time.

Car will not lock!

All doors and hatch securely closed, no spare key in car, inoperative using key or door handle lock; I have run out of options. ….Time to call out the cavalry.

So I phone the Honda assist number, and an hour later, a van in the guise of the AA arrived, to sort out my problem. He quickly ascertains that the 12 V battery is totally flat, gives it some juice, and all is working normally. We decide that having had the ignition on for perhaps 20 minutes, using the electric pump, and having the hatch door open with the courtesy light on, has done the deed. I have a battery charger, and he recommended that I leave the battery on charge for 12 hours.

The following day, I am sat in the car, having pushed the engine start button twice, looking at all the coloured lights on the display, and wondering why it had never happened before.

Then I spotted it.  An extra red light,….or 3 to be precise.

Yes, (she who must be obeyed), had not turned off her heated seat. I wish it would turn off automatically when the ignition is turned off, but it doesn’t, and she forgot.     20 minutes/heated seat/battery flat!

So,(pleased that it wasn’t an intermittent fault), we live to fight another day.

Enjoy your Jazz as I do.









corbett

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Re: Flat battery (my fault).
« Reply #1 on: April 05, 2024, 12:12:39 PM »
Hi

I know that when I turn the ignition off, the heated seats do go off, but when when you restart the car the heated seats do come on again at same temperature as before.

5thcivic

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Re: Flat battery (my fault).
« Reply #2 on: April 05, 2024, 12:42:17 PM »
That also has confused me. What is the reason? Do people in Finland or Norway do short journeys where they have to switch off and lock the car and want the seats on again when they start off again? I also don't like the sequence of three pushes to switch off. If you had setting 3 and don't need it anymore, surely the next push to off is logical?
Mind you I don't live in a winter snow country much, or drive in the snow so I'm not familiar with much heated seat use, but I find them absolutely brilliant in the cold - and the steering wheel, much faster than waiting for the heating.

John Ratsey

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Re: Flat battery (my fault).
« Reply #3 on: April 05, 2024, 06:43:41 PM »
The following day, I am sat in the car, having pushed the engine start button twice, looking at all the coloured lights on the display, and wondering why it had never happened before.

Then I spotted it.  An extra red light,….or 3 to be precise.

Yes, (she who must be obeyed), had not turned off her heated seat. I wish it would turn off automatically when the ignition is turned off, but it doesn’t, and she forgot.     20 minutes/heated seat/battery flat!
There's nothing wrong with having the heated seats come on at the previous setting when the car is fully powered up but it's very careless of Honda's designers if they come on when the vehicle is in accessory mode.
2022 HR-V Elegance, previously 2020 Jazz Crosstar

Kremmen

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Re: Flat battery (my fault).
« Reply #4 on: April 06, 2024, 03:59:14 AM »
Keep an eye on the battery

Once they have gone completely flat they can lose charge rapidly

We had a new Metro, she left the lights on. Even after a long trickle charge and two consecutive 100 mile journeys the battery still died again overnight

New battery, problem solved
Let's be careful out there !

Lord Voltermore

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Re: Flat battery (my fault).
« Reply #5 on: April 06, 2024, 07:28:21 AM »
Plug-in tyre pumps draw a lot of amps  and that alone might push a nearly flat battery  beyond its limits in similar circumstances . But the heated seats would certainly increase the risk.  Others have reported the battery going flat  whilst waiting in the car with just the radio on ..(but had they checked the heated seats were not on   ;) )   

I always carry a little power pack type  jump starter  in the car. Smaller than a paperback book.    My hope is that in these circumstances it would give enough boost for the 12v battery to do its computer checks etc and allow the car to start  from the HV battery .
But I have not yet needed to put it to the test.   
 
« Last Edit: April 06, 2024, 07:34:18 AM by Lord Voltermore »
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coldstart

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Re: Flat battery (my fault).
« Reply #6 on: April 06, 2024, 08:35:21 AM »
...
I always carry a little power pack type  jump starter  in the car. Smaller than a paperback book. ...

Might I inquire how often you recharge the power pack?
I've recently bought a Noco Boost for the same reason and have yet to figure out a reasonable recharge cycle.

Lord Voltermore

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Re: Flat battery (my fault).
« Reply #7 on: April 06, 2024, 08:56:27 AM »
I normally top it up about every 3 months, by which time its down to about 75%. (mine  has  25-50-75-100 indicator lights.  )  Easy for me to remember as Christmas, birthdays ,anniversary   are at  about the right intervals  (for a recharge   ;)  )  Which reminds me. It will be due soon  , and mustn't forget its also my wifes birthday  :-*
« Last Edit: April 06, 2024, 09:02:42 AM by Lord Voltermore »
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davejazz

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Re: Flat battery (my fault).
« Reply #8 on: April 06, 2024, 05:43:31 PM »
Keep an eye on the battery

Once they have gone completely flat they can lose charge rapidly

We had a new Metro, she left the lights on. Even after a long trickle charge and two consecutive 100 mile journeys the battery still died again overnight

New battery, problem solved

Thanks for that Kremmen.

Those thoughts will be going through my mind , as I count sheep tonight, prior to my 250 mile trip tomorrow!

Ha ha.


Kremmen

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Re: Flat battery (my fault).
« Reply #9 on: April 07, 2024, 05:02:55 AM »
An alleged expert told me that car batteries have 2 stages of charge

Stage 1 is performed at the factory and that stage is very stable and allows the battery to sit on shop shelves for a very long time without issue

Stage 2 is what your car performs from stage 1 to 100%

He said if you drain the battery completely then you need a specialist charger to recharge stage 1, your alternator cannot charge stage 1 and without stage 1, stage 2 just keeps self draining so you have zero charge.

I don't know if he was right but made sense to me
Let's be careful out there !

Lord Voltermore

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Re: Flat battery (my fault).
« Reply #10 on: April 07, 2024, 10:18:49 AM »
Using a voltmeter that plugs into the cigarette lighter socket I have noticed that  ,even when the car was almost new, the battery sometimes showed less than 12 volts if the car hasnt been used for a while.

By conventional battery wisdom less than 12 volts could  indicate the battery is flat. Or even faulty.  But the  car has always started, even now when its 2.5 years old.  So apart from making sure I have  back up plans  I have ceased to worry about it. 

My typical driving pattern is unusual.  I sometimes drive 2000 miles in a  few days, then the car may only do  short trips ,with long periods inactive. Last long trip early March, a couple of very short runs since then,Mainly to de rust the brakes,  and last wednesday  a trip of 10 miles, park, 1 mile park again then 10 miles home. 

Today Voltage was 11.7 volts at rest. .  Car started  fine and the  voltage immediately went to a typical  charging voltage of 14.4 Volts,  both with the ICE running and  in EV mode.

I am certainly no expert , but I think the new fangled smart chargers, or at least some of them, are able to give the pulse charge necessary to  revive and charge a flat battery  as long as it hasnt been left fully discharged for too long.   

  Trust a dog to guard your house  , but not your sandwich

davejazz

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Re: Flat battery (my fault).
« Reply #11 on: April 20, 2024, 08:20:34 PM »
Keep an eye on the battery

Once they have gone completely flat they can lose charge rapidly

We had a new Metro, she left the lights on. Even after a long trickle charge and two consecutive 100 mile journeys the battery still died again overnight

New battery, problem solved

Thanks for that Kremmen.

Those thoughts will be going through my mind , as I count sheep tonight, prior to my 250 mile trip tomorrow!

Ha ha.

So,…. drove the 250 mile journey, parked up, and went on my holiday for a fortnight.

On the return today, it started first time.

Because most of the 500 mile journey was motorway, I have seen my average mpg figure drop from 72 miles per gallon, to 69 miles per gallon. Still, shouldn’t grumble!





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