Those vampowerpro batteries look nice but the 2250 is only rated for a 12C discharge. I'm using Apex 2100 packs on my hot glider and now my 3DF F-14, and they are rated for 15C discharge and are tested for more than that. They are also 20% less expensive. I flew one in my 3DF SuperCap and it had big power compared with my (lighter) Falcon 1550.