Hi Rodger
I've used an Anti-gravity battery on my BMW R1200 GS and whilst it was OK it needed to be constantly on a specialist battery conditioner and despite the claims by the manufacturer of peak Cold Cranking Amps (CCA) the performance was not as good as a traditional lead acid battery. Also the they do fail they give absolutely zero waring and just stop 100%. After about 2.5 years mine gave up and I went back to a lead acid which then lasted at least another 6 years. I always have my cars on C-Tek battery conditioners all the time and my BMW motorcycle on an OptiMate Can Bus compliant conditioner.
Overall therefore I was not impressed.
I also bought some of their emergency starter packs and they have not stood the test of time either and I have now switched to NOCO which seems to be a better quality product and seems to work much better - not sure if they offer Lithium batteries as well as the jump start packs. I did find this on the web and confirm I've never used their batteries, only the jump starters:
https://no.co/products/lithium/powersports
