AHTECH Infinity 4S 14.8V 1500mAh 85C Graphene LiPo Battery XT60 Support 15C Boosting Charger
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Okay, let me get this clear: This is NO GRAPHENE! At least it does not deliver power like a real Graphene Battery. But: It's a decent battery. Has real 1500 mAh and delivers enough power (well, no 70c, but enough) for training. In my opinion, they are a little bit less powerful than the Dinogy which only costs 1$ more: http://www.banggood.com/Giant-Power-Dinogy-1500mAh-14_8V-4S-65C-LiPo-Battery-For-RC-Airplane-Multicopters-p-1033107.html?p=430714520645201404S1
Battery arrived very well balanced, max difference was 4mV. Fully charged internal resistance 17 mOhm, cells (5,5,3,4 mOhm). Discharge capacity @ 1.5A discharge current and ending cell voltage 3.3V was 1523 mAh. Measured using Turnigy Reaktor charger. It seems a really powerful battery.