A size comparison versus the stock M3 battery. The battery in front is from the Scion xA, and was hooked up so that we wouldn't lose our settings from the car.
Friday, June 22, 2007
Installed lightweight 4.5 pound battery in BMW M3, replacing stock 50 pounder!
So, we've made a lightweight 4 pound starter battery for gas cars. Took us several prototypes before we got to our final working configuration. Issues like power, charging, casing, configuration, balancing, hookup terminals, etc, had to be figured out. But in the end, it was worth it! We've saved almost 45 pounds from the BMW M3. Notice the lack of a spare tire in the M3, there's run-flat tires and an air compressor instead, to save weight. The stock 3 series has a spare.