I am sorry for being so silly.

My large car battery compared to the lithium is over 15kg to 20kg lighter.

The drag strip may be very different but I can assure you that I can do a faster lap around a circuit without a passenger and replicate that many times.

Re- read the reference to F1, my point was that 20kg change in weight there would change the outcome of the race for certain and the engineers would jump at the chance. All weight savings add up, if you can save a kilo here and there it makes a difference, if you do not accept that then power to weight ratios will not make sense either.

100kgs makes a massive difference to the handling of any car along with the longevity of many of the cars parts.

I will let the thread get back on track as this will only end in a silly internet argument.

If you want to buy a battery that is lighter then do so, if not then don't.