I've got three Luna batteries. No explosions, fires, or wake-up-dead yet.
1) 48V 11.6AH Dolphin with Samsung 30Q cells. Purchased August 2015. Not used much. Was shipped with a 52V charger and I never realized it til this winter. Screws missing on the case. USB port fake. Can't find metric screws that are 3 inches long, so I replaced with standard thread.
2) 48V rack battery with GA cells. Purchased a year ago. About 400 miles on the battery.
3) 52V Luna Mini with GA cells. Purchased last November. Its charger died in January. Don't like XT-60 charging port with male plug. Shorted it out twice on rivets and screws. Now I keep a dummy plug on it.
I also have a 36V 10AH Dolphin from elifebike in China purchased in July 2015. Unknown cells. Claimed to be Headway, but cells are 18650's. Cost $280 shipped. Real USB port. Must be a very reliable battery as it still works.