Grabat claiming 1000 Wh/kg for a new battery type (graphene), that would mean around four times the energy density compared to Lithium. That would be roughly 2h fly time for a drone of today's standard if this is true. Grabat introduces its graphene batteries - www.energynews.es Discussion on HackerNews: Energy revolution? Grabat introduces its graphene batteries | Hacker News Edit 1: A lot of doubt can be found e.g. here: Grabat introduces its graphene batteries - certified by TÜV and Dekra - energy density of 1,000 Wh/kg - production mid 2016 • /r/tech Edit 2: Guy on rcgroups currently testing preproduction samples of graphene batteries for HobbyKing: Turnigy Graphene - RC Groups I have no idea if this is related in any way. All of the above should be taken with a **** load of salt!