This 2-pack of single-cell Lithium Polymer 180mAh battery packs give you lots of extra runtime for your Blade mCX, mCX2, mSR, mSR X, Nano QX, Nano CPX, and UMX AS3Xtra. These batteries are also ideal for the ParkZone Vapor, Micro Citabria, Cessna 210, Ember, and the Parkzone Sukhoi among other micro planes. These batteries are plug-and-play compatible with both the helicopter and the stock charger. 45C continuous discharge rate.