Interesting development, about $720 (In Japan) price without AC charger, time will tell if Honda will decide to sell it in US, Honda Worldwide | August 31, 2017 "Honda to Release LiB-AID E500 Portable Battery Inverter Power Source"
At possible 2 $/kW it is expensive if compared to AGM but could be a good lead for others to follow with less expensive units.
Similar price to Goal zero 400 https://www.rei.com/product/123285/g...-power-station
with 500 verus 1000 for Honda recharging cycles life.
For $500 it could be a good and nostalgic looking battery back-up. I had the old Honda generator back in the eighties, see the picture.