Steve_E

After a few years away from BMW, I have recently purchased an E61 525d Auto 2009. Car is great. Some good history from the most recent owner (missing some before that). One thing I noticed the other morning when I had the door and boot open to load in some stuff, go to start the car and a warning came up with "Increased Battery Discharge". I probably had the doors open for about 20 mins or so, and I guess the interior lights were on, but that was all. Should I be expecting this message just for having the doors open for a while? I then did a short run, and when I came to start the car, it came on again. As I got home, I had to wait for a bin lorry, and I sat there with the radio on, without the engine running, probably for only a minute or two, and then a warning came up saying "Battery charge extremely low". Again, is this normal? I have read that a short on an aftermarket tow bar is a common issue, anything else I should be looking for? Thanks in advance