The embedded posts provide the maths - Solid State batteries (lithium) is about 2kg lithium per kWh. Other batteries are around 0.9 kg lithium per kWh. Theoretical efficiency is actually around 0.4 kg per kWh, but time will tell whether that is achieved.
In this post - Post #:38125358 for vanadium on my calcs the theoretical efficiency of vanadium batteries is around 3kg to 4kg per kWh, but due to issue around energy density the reality is it is now around the 5.5kg to 6 kg mark per kWh.
Anyway I haven't delved into these issues for a while, but maybe for those interested go through my embeded posts and hopefully come up with your own calculations as I did those calcs a while back.
All IMO
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