I have a Gunsen battery saver which I have always used on various cars basically you plug it into the mains and into the cigarette lighter socket and it maintains everything whilst changing the battery but the 12 volt socket has to be live with the ignition off and on newer cars its usually off.
Now moving into the 21st century with my Cupra you have to tell the ECU you have changed the battery and register the new batteries details with a diagnostic scanner that is capable of passing the VW security firewall for which you have to pay.
Now then you can fit a battery saver that uses a spare battery or a AA 12 volt battery pack which plugs into the OBD port and maintains the 12 volt supply to the ECU hence retaining all relevant information so theoretically you could replace the cars battery without having to register the new battery detail or would that work!
Thinking about it if you connected jump leads to the connections on your existing battery then removed those connections from the existing battery and then replaced the battery would that still achieve the same effect ie no need to change the battery detail.
So can anyone who is really clever wth modern car electrics explain if that would work, I`m only asking as I have 3 three scanners including a dedicated VW Audi group scanner all three are supposed to allow you to change battery registration but they will not bypass the VW security just to change the battery, there are a few scanners that will allow you to do this but you need the scanner and also pay a subscription/licence fee and I don`t really want to have to buy anymore diagnostic scanners just to change the battery!
All this palaver just to change a 12 volt battery so does anyone have any advice on the above?
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Del.
Battery saver
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Delanor
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Re: Battery saver
If the battery needs changing then the PCM will already have adopted a strategy (charging, load, stop/start, etc) to cope with a dying battery.
If you use a stealth process to replace that with a new battery, then there's a good chance that it could be damaged by the continued use of that (now wrong) strategy.
Manufactures didn't introduce the registration process to given dealers more jobs to do, it's required because modern vehicles have to get the last ounce of performance from what they have to work with.
Some battery places don't charge anything to re-code a battery, especially if you've bought from them but not always, for goodwill.
If you use a stealth process to replace that with a new battery, then there's a good chance that it could be damaged by the continued use of that (now wrong) strategy.
Manufactures didn't introduce the registration process to given dealers more jobs to do, it's required because modern vehicles have to get the last ounce of performance from what they have to work with.
Some battery places don't charge anything to re-code a battery, especially if you've bought from them but not always, for goodwill.