Author Topic: Battery replacement  (Read 1451 times)

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Offline elduderino

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Battery replacement
« on: November 11, 2018, 08:49:29 AM »
Hi
My car battery needs replacing.
Have i got to go to main dealer, or some one like Halfords,  or can i just buy one & do it my self?
The only info i can get off the Factory original battery is the following
LB4438
SHo2 LB310
Stop Start
021213G

Regards

Offline elduderino

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Re: Battery replacement
« Reply #1 on: November 12, 2018, 12:17:48 PM »
Hi

have discovered the battery that was factory fitted. Its a https://www.yuasa.co.uk/ybx7335.html. Its £289.72 to replace.
I have a family member who works for Banner Batteries, & can supply the same spec battery for £120. (but not fit)
All i want to know is can this be done by myself, or is it a specialists job?

Regards

Offline cwilliams255

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Re: Battery replacement
« Reply #2 on: November 12, 2018, 09:57:10 PM »
I’d say fitting a new battery is well within the realms of what a reasonably competent person can do. That term of course is open to your own interpretation but just be careful with metal objects around the battery to avoid any sparks, the weight of the battery when lifting it out and keeping the battery as level as possible to avoid any acid spills. I’d imagine there are plenty of videos online to provide guidance. I have a gen 2 and replacing the battery was easy

Offline elduderino

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Re: Battery replacement
« Reply #3 on: November 13, 2018, 07:54:16 AM »
Hi
Thanks for the reply

Sorry , i haven't made my self clear.
What i am concerned about is when the battery is removed will it have any effect on the Computer management/system software/Memory, (that sort of thing) if power is lost?

Regards
« Last Edit: November 13, 2018, 07:56:36 AM by elduderino »

Offline Alfisto

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Re: Battery replacement
« Reply #4 on: November 13, 2018, 09:13:24 AM »
I've not done it on the Mazda but on other cars, removing the battery generally resets the personal settings. Day, date, mph/kph, litres/gallons, some of the door lock options but it just needs to be gone through and reset. :)


Offline Engineer Andy

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Re: Battery replacement
« Reply #5 on: November 14, 2018, 01:09:38 PM »
I've not done it on the Mazda but on other cars, removing the battery generally resets the personal settings. Day, date, mph/kph, litres/gallons, some of the door lock options but it just needs to be gone through and reset. :)

Quite correct, at least that's what happened when I've had my mk1's battery replaced (twice in 13 years, roughly every 4-5 years depending on the type of usage).  I always took the safe option and had the work done at the dealership, who presumably took note of the settings and changed them back manually, or have some fancy device that can do it all at once.  I know that all my 'accumulated' trip computer figures (not the mileage) such as the average and overall mpg are always gone when the battery is replaced, and, I think, all the radio presets and audio settings and back to factory defaults for the UK, meaning you'll have to reprogram all the radio stations.  It may be different though for the mk3, whose system is obviously of a LOT newer design and so may be able to done far quicker and easier - I'll leave that to other forum members who have mk3 cars to say.

Not sure about the engine management system though, which perhaps need to run for a while to re-learn all the appropriate settings for the air-fuel ratio, etc etc, so the car might run a bit rough for 10-15 miles or so.  I've seen YT videos that show that it can re-learn after about 20mins.

Offline hanix

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Re: Battery replacement
« Reply #6 on: November 14, 2018, 03:58:51 PM »
I have always connected a spare battery with a pair of light jump leads in parallel, that way the car doesn't know the battery is being removed. 

Offline Willpower

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Re: Battery replacement
« Reply #7 on: November 15, 2018, 10:05:03 AM »
I have always connected a spare battery with a pair of light jump leads in parallel, that way the car doesn't know the battery is being removed. 

When I had a battery replaced a couple of years ago, that is exactly how my garage did it.  As Hanix says the car didn't even know that the old battery had been disconnected and there was no loss of stored information i.e   window settings/radio settings etc.
Look at life through the windscreen, not the rearview mirror.
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Offline StevenRB45

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Re: Battery replacement
« Reply #8 on: November 15, 2018, 01:46:22 PM »
If you don't have a spare battery you can get a car memory saver for about 15 quid, they plug into the cigarette lighter and provide enough power to keep the car from resetting.

Offline Alfisto

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Re: Battery replacement
« Reply #9 on: November 15, 2018, 01:51:54 PM »
The option of plugging in some temporary power to the 12v socket sounds a belting idea 8)

Offline hanix

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Re: Battery replacement
« Reply #10 on: November 15, 2018, 03:22:50 PM »
Just make sure it is pure DC. i.e. not rectified AC.

Offline Alfisto

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Re: Battery replacement
« Reply #11 on: November 16, 2018, 09:55:01 AM »
What, like a battery charger?

Offline hanix

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Re: Battery replacement
« Reply #12 on: November 16, 2018, 12:30:53 PM »
Absolutely, Even a small ripple can play merry hell with a cars electronics.The backup battery can be quite small as there is very little current demand with every thing switched off.

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Re: Battery replacement
« Reply #12 on: November 16, 2018, 12:30:53 PM »