These Lithium batteries seem to be popular in racing circles at one third the weight.
https://antigravitybatteries.com/pro...es/automotive/
(They'll lighten your wallet even more!
)
There are plenty of reviews and talk on them if you search.
I'm guessing the casing used is mostly empty, so there's a space saving to be had by using the 'smaller' models too.
Anyone here using them?
Or making their own??