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BATTERY REMOVAL CAUSING MAJOR ELECTRICAL PROBLEMS?

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SonsCrashSlave

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Highcliffe, Dorset
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2.2 i-DTEC CU3
Has anybody experienced unexpected damage to electronic components due to simply disconnecting/reconnecting the battery on an Accord?

After recent experience with a Skoda Roomster, (on which this trivial exercise naffed the complex window regulator control unit - £139 for a new one), and that of a friend who got a bill for over £500 to replace some component behind the fascia of his BMW, I have discovered that this is a frequently occurring problem on many modern cars.

For what it's worth, apparently the problem can be averted by turning the side lights on prior to reconnecting the battery. That damps out surge spikes that kill sensitive components. Apparently.

Fingers crossed. I'm about to find out
 
From what I heard our accords should be ok for jump start starting
Just don't leave the keys in pre ignition or anything prior to jump starting.
Connect the jump start as normal - and then insert keys to start the engine.
 
Thanks for taking the trouble to reply, but it's not jump starting that concerns me. It's the physical disconnection/reconnection of the battery harness when removing the battery. This causes sparks that can generate voltage spikes on the leads which, on many modern cars, is known to destroy expensive control units and other electronic components. I was wondering whether this had ever happened with recent Accords.
 
Changed two batteries on my 7th gen no problems whatsoever, just open the bonnet and undo the clamps, remove the positive first then the neg, remove the battery stays and lift out. keep the keys in your pocket. No radio code on the 7's just need to retune to your favourite stations again. Not had occasion to play with the battery on my mark 8 yet.
 
Surely that's what the main battery fuse protects against, spikes etc?

The only way I think you could fry something is by getting the terminals the wrong way around, maybe when jump starting also, that would do it.
 
A fuse will not protect against voltage spikes, unless the spikes cause large currents and the fuse is quick-blow.

Also, jump starting does not damage either car, unless the leads are removed with the engines running i.e. you can jump start with the donor running on idle, but once the "flat" car is running, it is not advisable to disconnect the leads https://www.theaa.com/breakdown-cover/using-jump-leads.htm ....and even if you connect without the keys in either ignition and then start the "flat" car, the same principle may apply

As for fitting a new battery into a car, as long as the keys are out of he ignition, there should not be a problem ......"sparking" the terminals around on the battery is not what I'd expect anyone to do
 
edgeoftime said:
Changed two batteries on my 7th gen no problems whatsoever, just open the bonnet and undo the clamps, remove the positive first then the neg, remove the battery stays and lift out. keep the keys in your pocket. No radio code on the 7's just need to retune to your favourite stations again. Not had occasion to play with the battery on my mark 8 yet.
Click to expand...
Always thought positive comes off last and goes on first

http://www.racshop.co.uk/car-battery/how-to-fit-a-battery.html
 
I've never had a problem, Just remove the Negative lead first and put this back on last. Also, make sure the keys are in your pocket and there are no loads on the battery when you do it.
 
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