While the original release of the HG2 was in 2014, production became available in Summer 2015. A 20 amp, 3000 mAh milestone is, in some way a holy grail of stats. A battery that can both be high-drain and high-capacity is just what everyone wants. The HG2 can be seen as a 500mAh capacity upgrade from its predecessors the HE2/HE4 which also have a 20A discharge limit.