DEAR...
You could probably do a lot bettery in size and weight with Li-on batteries but it would bend you over to pay for them and you would need a fully engineered system to keep it safe enough to minimize liability.
Inverter Battery
THANKX...
difference between getting a withstand rating of 25kA or 65kA, and to make the device larger to allow for more separation in this case the single hole lugs do rotate under duress.