Hi all, I have the dreaded red 'Batt Symbol - Visit Workshop' error on my dashboard since past day or so. I have read up on all the older threads and am aware of the likely causes but just had a few questions which I couldn't get answers on: 1) Where is the best place to get an aux battery from apart from the dealers? I've looked at ECP/GSF but they don't seem to have a listing. There are a few on eBay but shipping will take a while. I am based in Glasgow. 2) Is there any way of disabling the error on the dash? It would flash up now and again but now it remains permanently on with loud beeping, its driving me nuts! The car starts fine and runs no probs though some of the convenience features get disabled after a few mins then the beeping starts. I've still to measure the voltage on both batteries which I will do later tonight. Just to also add my serpentine belt recently broke and was replaced along with the idle pulley about 2 weeks, car working fine after it was done. Also the main battery was replaced 18months ago. Car is a W211 '04 E320CDI. Cheers.