Battery protection mode

[huggy1]

The other day, I switched off the engine in my V8, the heater was on low and the MP3 player was on. After about 7-8 minutes the battery protection mode cut in. The manual says this will happen if the battery drains to a level where it will not start the car.

I thought the time was a bit on the lean side but does anyone have any views on this?

[huggy1]

Thanks to all for responses. I guess that I'll have to keep an eye on it especially over the coming colder months, only had the car a few weeks so if the battery is a bit suspect I really should get it tested as soon as so I can nag the dealer. In the old days the only way of properly testing a battery was using a drop tester which basically drained the battery in a very short time, if the battery held up for 10 seconds (I think) it was deemed to be OK. Not sure how they do it nowdays?