Renault Laguna II - Phase 1 - Flat battery issues - Page 3 - Renault Forums :: Independent Renault forum

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post #11 of 16 (permalink) Old 24th April 2006
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Originally Posted by Laguna II Owner
I'm off to Halfords to issue a copyright infringement notice against our How To Articles

How to check you battery

I checked the Halfords site,

How to Spray Paint your car is one of the articles.........

Time to allow one hour................

I think I'll change mine to red if it's that easy!

They copied our site!
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post #12 of 16 (permalink) Old 25th April 2006
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Originally Posted by WebCode
I would advise against jump starting your vehicle from another car.. As this can cause voltage spikes that will destroy the ECU & or UCH etc..

If you use a boost charger to jump it, then turn the sidelights on before connecting the charger then start it.. This seems to help in lessening the chance of killing the onboard electronics.
Have you had issues before where people have damaged ECU 's as a result of jumpstarting on newer vehicles? I'm aware it used to be and issue a few years ago but it seems manufacturers became aware of this and have rectified the problem.

Originally Posted by WebCode
As for the battery dying.. Well the heater motor does draw a fair bit or current.. But the Batteries fitted to Megane II are a known problem.. Its not unusual for them to fail after 18-24 months..
I'm glad we're not the only ones to have problems with these batterys. Sometimes they last less than a year here. With the heat the electrolyte evaporates and the battery is sealed so it cannot be re-filled
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post #13 of 16 (permalink) Old 25th April 2006
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I'd be genuinely surprised - and more than a little worried - if a fan could draw enough current to flatten a car battery in only a couple of hours!

I would suggest that you guys are right, and it's probably the battery which is at fault.

How does jump-starting a car fry the electrics though? Surely all the on-board electronics would see would be a rectified, high-current 12v power source, as the other car's alternator would have rectified the power already?

Surely that can't be *too* different to just starting with a regular battery?

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post #14 of 16 (permalink) Old 26th April 2006 Thread Starter
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I jump started the car on Monday night (thankfully) without any bother. The battery wasn't totally flat as the dash lights would come up but there wasn't enough charge to start the engine.

Wish i'd read the "don't jump start from another car" bit first though. Fingers crossed that there's no damage!

For those that asked, the car is nearly 3 years old. We've only had it for a month but i'm guessing that it is the original battery that is in the car.

Thanks all
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post #15 of 16 (permalink) Old 11th June 2006
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Jump Start Issue

After a Jump Start I lost my Dashboard - cost 500 for a new one - now the mileometer is set to Zero is offline  

battery , flat , issues , laguna , phase , renault

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