Audi A4 Ok to use smart charger?

[Stevemr]

I Have a 2007 A4 cab, 3.0 TDI. I am trying not to use it much in winter cos of the salt.
I have one of those smart chargers that you use on classics, you can leave it plugged in all the time and it controls the amount of charge. It has a separate lead you an attach to the battery and then just plug the charger in when you need it.
Are there any problems with charging the battery in situ. I have it in the back of my mind this can cause problems with modern cars electrics, but not sure?

[kent_phil]

I've got 2 CTEK conditioners secured to the wall of my garage for exactly this - have used them on all my Audi's and other cars if they are due to stand for two weeks or more in the garage without moving.

Over many years of doing this I've never had an issue including my current Q7 and RS5.

I think the downside of a discharged battery or the bizarre behaviour a low battery can cause is a far higher risk.

One tip I've learned the hardway though is that I have a piece of A4 paper with 'WARNING - CONNECTED TO CONDITIONER' I stick under the windscreen wiper of a car when I hook it up...you can fill in the blanks why

[rich83]

The chances are that (providing your battery is in good condition) you could leave it parked up for 3 months and it would start first time. I wouldn't bother with a charger.

[Big E 118]

I've got a CTEK charger/conditioner on my Audi, no problems. Mine won't charge through the ciggie lighter socket or socket in the boot though and has to be connected directly to the battery, not sure if all Audi's disable the sockets when the ignition goes off.

It's a good idea to add a reminder that it's plugged in!

[Stevemr]

Great thanks for the quick replies its a CTEK. I will get it plugged in.

Good tip about note on the wind screen!

I dont think you could leave it for 3 months, it usually gets left about 3 weeks and it starts, but you can tell its a bit sluggish!