Started the car this morning and the engine management light came on as I was driving, with the message engine managment fault.When I got home I put the battery on charge and then had a look in the manual,it says you must disconnect the battery as it may harm the electrics,I then removed the charger started the car and the light had gone out I have just given the LR a good blast up the M1 and all is ok,Does it harm the car to charge the battery in place with it connected.

no problems, At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

I think they really refer to the big battery charger types that give it a very rapid boost charge, Ive used the trickle charger that charges on 2amps ok without disconnecting it without any problems to give the battery an extra bit, especially in winter, and Ive now got a charger that can be left connected if the cars not used for a while, it exercises the battery and keeps it in top condition, again no need to disconnect the battery leads.

Thanks guys Mona what charger is it that you use.

A smart charger is what you need Costco have them Ctec is a good one even Lidl keep having one in.