So I was a bit bored today, and was cruising one of the e39 M5 boards. There was a thread about light weight batteries. A few of them have used a 21lb battery from http://www.braillebattery.com/index....tteries/b3121/ with success. This is an approx 40 lb savings over stock. With the 20 I've lost, that's 60lbs+

The one in my 2003 530 is original believe it or not. Probably one day soon, it will die. I've been able to hedge some weight off the car (still weighs as much as a WW1 tank). Could this be a viable avenue to shed some more off, or am I asking to get stranded?

All opinions welcome