KERS adds approx 40kg so some teams aren't using it (especially if the driver is big boned!). 
 
There's 2 types of KERS in F1 right now, a big cap version & a fly-wheel version giving mechanical assist. 
 
Most people are using the caps. 
 
The techie stuff is what makes F1 so interesting for geeks like me! 
 
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