turBattery charge? Replace? Stop/Start?

[Fats25]

My wife has a 123D. After taking it in for a service earlier this year, the car was returned with the "car on a ramp" symbol displayed. I took it back the day later, and they "reset" something to fix this. However driving it home I noticed that the clock had also reset, so I assumed it was all related and reset the time. No problem.

I rarely drove this car, but when I returned my car in August, I began driving it infrequently. I normally turn the stop/start off in the car when using it as it is annoying, however I forgot last week. I noticed it was not kicking in at all when it should have been. After speaking with my wife she informs me stop/start has not worked since I took car in for a service, and that she resets the clock every time she uses the car after a few days of not driving it. She had never told me this before..........

Ideally I would like stop/start to work, but more key for me, is this is now only car, and I am concerned that it will let us down with a flat battery as the cold weather kicks in, probably on a day when we really need it.

So I was going to remove the battery, and give it a good charge this weekend with a smart charger (CTEK). However after looking at the number of cables to remove, and with the hangover I had I decided against it. Upon some brief reading today it appears that there is a specific order to remove pieces prior to charging, as otherwise the stop/start feature needs to be "reset" to tell it about the battery.

I have no idea if true or not - but would appreciate someone pointing me in correct direction for this process, if there is one. I briefly spoke to BMW and they wanted approx £200 to recharge the battery!

I did try to search on this, but search facility was down