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[lou]

Changed my battery recently, connected a small battery charger set to trickle charge, clipped small crock clips on terminals and removed- replaced battery without any problems and kept all codes. I can not think of any reasons why this method would cause a problem?

[markspark]

i wiil give it a go and report back

[Dave DND]

I can not think of any reasons why this method would cause a problem?

Neither can we, but I hear of it happening at least one a week at the moment, but really do not understand why. I can only think that some sort of voltage spike is being recorded somewhere?

[fiend61]

I can only think that some sort of voltage spike is being recorded somewhere

that is what i was trying to get at in my original post, the voltage spike will occur when you fit the clamps on new battery with the back up battery/charger still attatched, you will get excessive voltage going through the system maybe only for a split second until the back up battery/charger is disconnected, this spike could cause what dave is saying 

[Dave DND]

Way back when Noah first put an SRS system on his Ark, the general advice at the time was to put the headlights on so that any voltage surge would dissipate through the lighting system and would therefore prevent damage from voltage spikes.

However, have you ever tried to do this? as the voltage spike / arc from something major being powered up like the lights can actually burn out and damage the battery terminal as you are trying to fit it

Cant win !!

I think that changing the battery "quickly" gives you a 50/50 chance as to whether the code will be needed, and worst case scenario, I can decode it anyway, so not much of a problem really.

[markspark]

Job done code saved used battery charger on terminals worked very well im happy now the car will start in the morning and still have music for my trip  thanks for all the advice and offers to decode off Dave

[Dave DND]

Glad you are sorted